Solar System Wiring & Installation Circuit Diagram – 12V And 24V

This article is about different solar system wiring and installations with diagrams provided. The contents include a list of all circuit diagrams for various systems like 24 v and 12 v. Before going there, the most important thing to know is to know general requirements for the installation of a solar system installation which are:

  1. Photovoltaic Or Solar Cell 

Photovoltaic Or Solar Cell image

Amorphous Silicon Solar And PV Cells graphic-opv1-sun-illustrationAmorphous Silicon Solar And PV Cells

This is a 12 v, 60 watts and 5 amperes PV solar cell which can produce battery charging of 12 v. But before that, a charge controller is required to be connected.

  1. Solar Charger Controller –
Charger Controller for Solar Panel
Solar Charger Controller

Solar Charger Controller

Solar Charger Controller

This charger controller is between 5 to 10 ampere, and it controls the charge of battery or current.

  1. Solar Inverter –

 Solar Inverter

Solar Inverter

This is a 12v dc to 230v ac, 1000 watts inverter. The inverter has to be connected between the load and the battery output.

  1. Battery –

 Solar Dry battery

This is a dry battery 12 volts, 100Ah. This is to be connected to the charge controller.  The charge controller controls the current which comes from PV or solar module.

Battery for Solar Panel

Solar Inverter 12V 85ahCellGood Quality 12V 150Ah 12v dry cell rechargeable solar panel batterygel-deep-cycle-solar-batteryi

How solar panel works: can be answered here:

https://hotwaterheater.reviews/wp-content/uploads/2018/06/how_solar_panel_works.

The panel contains a number of items including:

  • The inverter(s) which convert from (DC) direct current to grid synchronised AC(alternate current)
  • Safety fuses and isolator switches, for the input from the PV panels, and output to the grid
  • Various meter’s for measuring the energy generated by the system, the voltage and current coming from the PV system

How PV Solar Energy works

Types Of Solar System Wiring & Installation Circuit Diagram

There are various types of solar wiring systems including:

  1. 12 volt, 18 amp-hr, 20-40 watt systems.
  2. 12 volt, 198 amp-hr, 85-130 watt systems.
  3. 12 volt, 36 amp-hr, 10-40 watt systems.
  4. 12 volt, 420-530 amp-hr, 260-390 watt systems.
  5. 12 volt, 265 amp-hr, 170 watt system.
  6. 24 volt, 36 amp-hr, 80-130 watt systems.
  7. 24 volt, 99 amp-hr, 175 watt system with 48 PoE injector.
  8. 24 volt, 210-265 amp-hr, 350- 525 watt systems.
  9. 24 volt, 265 amp-hrs, a 525-watt system with two 48 volt PoE injectors.
  1. 12 Volt, 18 Amp-Hrs, 20-40 Watt Systems – Microsystem

The diagram provided below is a micro-sized diagram which is a copy diagram of door wiring. The solar controller, fused blocks, terminal blocks, and factory wired components are housed in a polycarbonate pole-mounted enclosure. The wires shown in the diagram in solid lines are the ones that are factory wired, connected in the field, dashed to be wired and dotted to be joined by and provided by the customer. The solar module above the enclosure is also pole mounted.

12 Volt, 18 Amp-Hrs, 20-40 Watt Systems - Microsystem

  1. 12 Volt, 198 Amp-Hr, 85-130 Watt Systems- Large System

The diagram is a copy diagram of door wiring and is for an extensive network. A single solar controller module is housed in the order. Two batteries are required to be connected in parallel so that the system achieves the amp-hr rating required. The associated wiring and solar controller are housed in a pole-mounted aluminum enclosure coated in white powder. Factory wires are shown in solid lines, dashed are to be wired and connected in the field, and the dotted are to be joined by and provided by the customer.

12 Volt, 198 Amp-Hr, 85-130 Watt Systems- Large System

  1. 12 Volt, 36 Amp-Hrs, 10-40 Watt Systems- Small System

The diagram below is a copy diagram of the door wiring for one out of four small systems. The associated wiring and solar controller are housed in a pole-mounted aluminum enclosure coated in white powder. The factory wired are shown in solid lines, dashed are to be connected and wired in the field and dotted are to be connected and provided by the customer.

  1. 12 Volt, 420-530 Amp-Hr, 260-390 Watt Systems- Large System

This diagram is a copy diagram of door wiring for a system with solar modules and multiple batteries. The associated wiring and solar controller are housed in a pole-mounted aluminum enclosure coated in white powder. The factory wired are shown in solid lines, dashed are to be connected and wired in the field and dotted are to be connected and provided by the customer.

12 Volt, 420-530 Amp-Hr, 260-390 Watt Systems- Large System

  1. 12 Volt, 265 Amp-Hrs, 170-Watt System- Lager System

This diagram is a copy diagram of a door wiring for a more extensive system which contains two solar modules and one battery connected in parallel that provides the required level of power for charging of the cell. The associated wiring and solar controller are housed in a pole-mounted aluminum enclosure coated in white powder. The factory wired are shown in solid lines, dashed are to be connected and wired in the field and dotted are to be connected and provided by the customer.

12 Volt, 265 Amp-Hrs, 170-Watt System- Lager System

  1. 24 Volt, 36 Amp-Hrs, 80-130 Watt Systems- 24-Volt System

The diagram below is a copy diagram of door diagram which is for a 24-volt system. The 12-volt batteries and 12-volt solar modules are connected in parallel to produce required 24 volts for the solar controller. The associated wiring and solar controller are housed in a pole-mounted aluminum enclosure coated in white powder. The factory wired are shown in solid lines, dashed are to be connected and wired in the field and dotted are to be connected and provided by the customer.

24 Volt, 36 Amp-Hrs, 80-130 Watt Systems- 24-Volt System

  1. 24 Volt, 210-265 Amp-Hr, 350- 525 Watt Systems- Extra-Large System

This diagram is a copy diagram of a door wiring which is for a more larger system that shows three 175 watts, 24-volt solar modules which are connected in parallel that provides required power and 24 volts is yielded by connecting two 12 v batteries in series. The associated wiring and solar controller are housed in a pole-mounted aluminum enclosure coated in white powder. The factory wired are shown in solid lines, dashed are to be connected and wired in the field and dotted are to be connected and provided by the customer.

24 Volt, 210-265 Amp-Hr, 350- 525 Watt Systems- Extra-Large System

  1. 24 Volt, 99 Amp-Hrs, A 175-Watt System With 48 Poe Injector- Large System

The diagram shows PoE or power over Ethernet capability in the large order with a 175 watt, 24 volts and 99 amp-hr systems with 48 v PoE industrial injector. The associated wiring and solar controller are housed in a pole-mounted aluminum enclosure coated in white powder. The factory wired are shown in solid lines, dashed are to be connected and wired in the field and dotted are to be connected and provided by the customer.

24 Volt, 99 Amp-Hrs, A 175-Watt System With 48 Poe Injector- Large System

  1. 24 Volt, 265 Amp-Hr, 525-Watt System With Two 48 Volt Poe Injectors- Extra-Large System

This diagram is a copy diagram of door wiring for a 24 volt, 265 amp-hrs, a 525-watt system which contains two sets of 48 volt PoE industrial injectors. The associated wiring and solar controller are housed in a pole-mounted aluminum enclosure coated in white powder. The factory wired are shown in solid lines, dashed are to be connected and wired in the field and dotted are to be connected and provided by the customer.

24 Volt, 265 Amp-Hr, 525-Watt System With Two 48 Volt Poe Injectors- Extra-Large System

Types Of Solar Panels And PV

PV Cel Type for Solar

 

  1. Crystalline Silicon (C-Si) For PV Technology

 The crystalline silicon is a widely used crystalline form of silicon to manufacture solar panels made from crystalline (mono and polycrystalline PV) in the photovoltaic technology. Silicon used in solar panels made from crystalline are mostly used almost 90 percent. The primary factor that makes it most used is its purity which gives more ability to the solar panels for conversion of sunlight into electricity.Here is more info on it.

Global PV demand trends from 2006 to 2020Cyrstalline Silicon Photovoltaic Module using Engage_PV Polyolefin elastommers

Power Output using PV encapsulant films over 25 years

  1. String Ribbon Solar Cells

 In this process, crystalline silicon foils and strips are manufactured for PV or photovoltaic technology. Wires that are resistant to high temperature are used to form thin ribbon crystalline silicon crystals by pulling them through molten silicon. These thin ribbons are then cut in various lengths to form solar and PV cells. These string ribbon solar cells are also made from polycrystalline silicon. Check educational resource here.

String Ribbon Solar CellsString Ribbon Solar Cells1

  1. Amorphous Silicon Solar And PV Cells

It is a subcategory of thin silicon film solar cells and is recently becoming very popular everywhere. These amorphous silicon PV modules use very less silicon around 1 percent in the crystalline solar cells. These are also very efficient than mono or polycrystalline solar panels or PV modules.Read more here.

100W-Thin-film-amorphous-silicon-solar-cell

amorphous-silicon-solar-cell

  1. Thin Film Solar Cells (TFPV) Or (TFSC)

These are also called TFPV or thin film photovoltaic cells and too amorphous PV modules. The necessary process to make them is integrating thin layers of PV materials may be one or even more on a substrate like metal, plastic, glass, etc. It is a second generation PV cell. The thickness of these thin films can vary from nanometers to micrometers.

Thin Film Solar Cells (TFPV) Or (TFSC)

 

Thin_Film_Flexible_Solar_PV_Installation

Thin Film Solar Cells (TFPV) Or (TFSC)

 


Here We are adding FAQ’s related Tankless Water heater:


 

  1. Cadmium Telluride Solar Cells (Cdte)

This type of solar cell is based on the element Cadmium Telluride. These are the only solar or photovoltaic technology that is very cost effective in comparison to crystalline silicon solar panels especially in the multi-kilowatt system of the market.

CDTE Cell

cdte-photo-flex-film

thin-film-solar-cells

The efficiency ranges of these PV modules are between 9 percent to 11 percent.

  1. Building Integrated Solar Panels Or Photovoltaic Panels (BIPV)

They are not something very new but same as silicon crystalline or thin film solar panels. They are just made in the shape and design of the roof tiles. BIPV or building integrated photovoltaic panels are designed in a way to let them be part of the building like roofs, walls, windows, facades and other things which can fit solar cell materials. The best example of building integrated photovoltaic panels is solar shingles which look very beautiful and charming but are a little expensive.

building-integrated-photovoltaics

building-integrated-photovoltaics


How Good are Tankless Hot Water Heaters?

After searching the internet for your new home water heater, you should have come across tankless water heaters and wondering if they are really good. And you are at the right place. So let’s go ahead and have a look at the goodness of these tankless water heaters;

The best way to understand if tankless water heaters are really good is to compare them with traditional storage-type water heaters.

Difference between conventional and tankless water heaters:

Traditional storage-type water heaters store and preheat water in a sealed tank, which reduces loss of heat to some extent. When the temperature of water in the tank goes below temperature set in the thermostat of the heater, the heater re-heats the water again resulting in wastage of energy in the process. Once the water in the tank gets heated it is used for various needs. The tank is refills again and heats the water.

Tankless water heaters on the other hand do not have a water tank as such and hence their name. They heat water as and when there is a requirement (uses a sensing technology). This vastly reduces the energy lost in pre-heating and re-heating as in a traditional water heater.

Now that we have seen the basic difference between a traditional and tankless water heater. Let’s take a look at the pros and cons of the tankless water heater.


Advice for selecting right tankless water heater is given in detail.


Pros:

Savings: With features such as demand based heating, high energy efficiency, fewer maintenance tankless water heaters are sure to reduce your heating bills in the long run.

Compact: These heaters are built so small that they take very little space. And they can be easily mounted on your walls.

Durability: Tankless water heaters are built sturdily so that they last a minimum  20+ years.


Best under sink water heater based on top reviews.


Cons:

Initial Costs: The major factor that stops people from moving to tankless water heaters is the high initial cost. But they are sure to make up for that in the long run.

               

How do you install a tankless hot water heater?

How to install a tankless hot water heater?

Yes, installation charges of tankless water heaters is on the higher side and will set you back by around 1000 dollars. But there’s a reason for it, tankless water heater installation involves installing large gas pipe lines, exhaust systems and working with high voltage electric lines. We highly recommend getting the installation done by an expert rather than taking chances. If you still want to Do It Yourself (DIY), we have you covered with the below installation instructions. 

Read Steps to understand installation of tankless water heater

  • First make sure to close the valve of the main water supply of your house
  • Detach water inlet connection from your old water heater. Make sure to drain the residual water from the inlet pipe.
  • Make sure to disconnect the power source from the old heater. In case of a gas powered heater close the inlet gas valve, and for electric powered ones unplug the main power source.
  • Discard the old water heater making sure to comply with the local law.
  • Keep the manufacturer manual by your side and go through the manual carefully before proceeding with the installation, and have the necessary hardware stocked as instructed in the manual.
  • Make markings on the wall to make sure the heater is mounted in the correct position per manual.
  • Now that the heater is mounted in its place, time to get it connected with the pipes.

Top rated Instant water heater  for your home


 

  • If it’s a gas powered heater, install ventilation ducts which normally is a stainless steel flue.
  • Now connect the water inlet and outlet ports to the heater to the water source and faucet/shower head respectively using special union connectors.
  • Once the water connections are in place, connect the gas inlet port to your gas source with connectors. Make sure the rubber sealants on connectors are in place. This avoids any leakage.
  • In case of an electric powered unit, simply plug it to an electrical outlet plug on the wall.
  • Once all the connections are done, open the gas and water inlet valves. Make sure there is no leakage of water or gas.
  • Light the pilot on the gas water heater as per instructions provided by the manufacturer.
  • Set the desired temperature on the thermostat, and now you are all set to enjoy your soothing hot water shower.

How long does it take to put in a new water heater?

The time needed to install a new water heater depends on factors like:

  1. If it is a replacement activity or installation in a new facility like home or office
  2. If the new water heater is the same as the older one or a new model has been chosen

Experts reviews on tankless water heater are with us.


The entire set of activities, however, include the following timelines:

  1. Removal of the old heating unit (60 minutes). This typically includes disconnecting the unit from source of power, draining the tank and disconnection of water supply lines to finally uninstall the old heating unit.
  2. Mounting the new heating unit in place (30 minutes). This includes unboxing the new hot water heater and moving it to the location of installation followed by placing the water heater at the correct place.
  3. Connecting the system (45-60 minutes). This includes connecting the hot water heater to sources of power and water. Usually, connecting an electric model takes shorter than the gas water heaters.

Like any plumbing activity, the above-mentioned timelines are only approximate and real time scenario may require slightly longer or shorter time duration. Therefore, always consult only professionally certified plumbers to undertake the task. Check out Bradford White Water heater and Rheem Water heater reviews for more understanding of the products.

 

How much is a tankless water heater?

What is the cost of tankless water heater?

This is quite a common question that comes up on the minds of homeowners who are planning to replace or upgrade to modern tankless water heaters. So, let’s take a look at how much do these tankless water heaters actually cost excluding the installation charges (discussed in another topic).

Broadly speaking, tankless water heaters cost anywhere between 100 dollars to all the way up to 2000$ (Yes, that’s quite a costly affair for hot waterJ). The price of tankless water heaters vary depending upon the energy efficiency, power source (electric or gas), hot water output flow rate, brand and build quality.

Generally, gas powered tankless water heaters tend to be costlier that the electric powered ones. Most of the reputed brands offer both gas-powered and electric-powered variants.

A good quality electric tankless water heater should cost you around 500-700 dollars. On the other-hand a gas-powered tankless water heater, from a reputable brand, should cost you 1000 dollars or more. Check Bradford White water heater prices to understand this.

There are also cheaper options available in the market for around 200 dollars. But on flip side they don’t come with warranty. So, if you are looking for short term solutions you can go for the cheaper variants.

One should take into account various consideration before making a choice between gas or electric powered tankless water heaters. Gas powered heaters are costlier than their electric-powered counterparts due to internal operating mechanisms. Currently gas is available cheaper than an electricity and that’s one factor that may influence your choice.

Although gas powered tankless water heaters are cheaper to operate compared to the electric ones, the energy efficiency of electric powered tankless water heaters would make up for the difference in fuel cost. Gas powered heaters heat quickly and have an output of more 12gallons per minute, which makes them a good option for large families.

Are tankless water heaters gas or electric?

If you are reading this article it is most probable that you have made a smart decision to install a tankless water heater in your house. Now that you have made up your mind to get a tankless water heater, it’s time to refine your search based on type of heater. Speaking of types, tankless water heaters are of two types, namely electric and gas powered tankless water heaters based on their power source.


Select right tankless water heater based on top reviews of this year.


It’s up to you to decide on what type of heater you are going to go for. The basic functionalities of both electric tankless water heaters and gas tankless water heaters are the same which is to provide you with non-stop, on-demand hot water.

The build and parts of these heaters differ based on the source of power they use. The electric powered tankless water heaters completely depend on electric power supply to heat water. Whereas the gas powered tankless water heaters use gas as their heating source and also require an electric power supply for initial ignition. Usually the electric supply for ignition comes from 12V batteries.

Generally, electric tankless water heaters are cheaper to buy and install compared to gas tankless water heaters. Electric heaters are able to meet high flow rate demands even in extreme weather conditions and last longer and have longer warranties compared to gas tankless water heaters.


Looking for right size than check 40 gallon tankless water heater with us.


Operational costs of gas tankless water heaters are marginally cheaper when compared to electric ones. This is based on the fact that currently natural gas price is cheaper than electricity. Over the past few years, price of electricity has been coming head and on the other hand gas prices have been increasing. If we are to take this trend into account, the operating costs of both electric and gas based tankless water heaters will moreover less be similar.

 

How do you know what size tankless water heater to buy?

So you have made up your mind to go for a tankless water heater but stuck with what size you should be going for. Don’t worry, we have you covered in our topic.

There are multiple factors that need to be taken into consideration before choosing the right size for your requirements. Remember that you should never try saving money by under sizing your tankless water heater because it will further cause your problems and increase your bills.

First determine on how many devices you would want to run with the hot water from your new tankless water heater. Figure out the total flow rate of these devices and add up their flow rates in gallons per minute. Now make sure the output flow rate of your tankless heater matches the calculated total flow rate.

If any of the device is far away from the heater, it will result in loss of heat by the time water reaches the device through long pipelines. In that case, we suggest going for parallel installation of two water heaters for individual devices.

Figuring out required temperature rise. To determine the required temperature-rise from your heater, subtract the incoming water temperature from the desired output temperature. Now that we have figured out the desired temperature-rise, let’s put it into use.

Let’s consider you are running 2 showers simultaneously; you may need around 6 gallons of hot water per minute from your heater. Ideal shower temperature would be 104-106 degrees. So if your incoming water temperature is 40 degrees, you would need a tankless water heater which produces 60 degrees’ temperature rise and has an output flow rate of 6 gallons per minute.

How much does it cost to install a gas tankless water heater?

The pace at which technology is advancing today, devices which are just a few years old have become obsolete today. And one such device is the conventional storage type water heater which soon may become a thing of the past. They are being rapidly replaced by new state-of-the-art tankless water heaters. They are energy efficient as well compact. Speaking of tankless water heaters, one might wonder what are the various costs associated with a tankless water heater. Apart from the actual heater cost installation charges are major part of the initial investment.

The cost of installing a hot water heater is not rigidly priced. It varies across regions and different models available in the market. It also depends on what necessary connections are already available on the site of installing your new hot water heater. The national average cost to install a water heater across America is tabulated below:

National average $1,036
Usual range $740 – $1,350
Floor cost $305
Ceiling cost $12,000

 

So, on an average installation of tankless water heaters cost between 1000 – 2000 dollars. Again, the installation costs will vary based on the type of your heater and additional hardware and wiring requirements of your home.

In case of gas powered tankless water heaters, you would require ventilation to send out carbon monoxide and modifying size of gas lines and fittings will require around 10 hours of labor. Labor costs may go higher for gas type tankless water heaters.

On the other hand, installation of electric tankless water heaters should be easier and cheaper. In most cases the pre-requisites for electric tankless water heaters would have been met with existing set up. This type of water heaters requires an electric outlet, an electrical timer and water supply lines. And the average time for installation would be 2 hours, thus reducing the labor charges.

The other charges in installing would be purchasing hardware such as valves, connection kits, mountings and fittings.

Most branded tankless water heaters come with very high performance and Energy Star ratings. This makes them eligible for tax credit under Federal laws. So, higher the Energy Star rating of your heater higher the tax credit you get.

How do you clean a tankless water heater?

How to clean a tankless water heater?

Tankless water heaters are built to last any 20+ years, but that depends on how often and how you maintain and clean the heater. Let’s a take a look at the steps in cleaning a tankless water heater and things are that are to be kept in mind while cleaning.

11 Steps to clean a tankless water heater?

  • As with cleaning of any electrical appliance, first cut-off the power supply (both electrical and gas supply in case of gas powered heaters) and please double check to make sure the power supply is cut-off before moving ahead with the cleaning.
  • Next make sure to close the water inlet valve that brings cold water to the heater. Please refer to your manufacturer manual to identify the valves.
  • Remove the purge valve to release any pressure that is built inside the vales.
  • Handle the caps and valves carefully so that the rubber washer sealing discs remain in place.
  • You will require a small circulation or sump pump and connecting hose for flushing. Connect the output of the pump to the cold water hose.
  • Most probably you will be using the water heater for your drinking and bathing needs as well, so we advise you to use undiluted food grade white vinegar as a cleaning agent. Usage of any other chemical cleaners should be strictly avoided.
  • Pour 4-5 gallons of vinegar in a bucket, and place the drain hose of the heater and inlet hose of the pump in the bucket.
  • Also refer to the manual for instructions on the flushing operation. Open the valves and run the pump for 30-40 minutes continuously.
  • Once the flushing is done, remove the pump and drain the vinegar from the heater. Allow fresh cold water to run for 5 mintues so that any traces of vinegar is removed. Also make sure to clean the screen filter of dirt or sludge.
  • Turn on the valves and run any hot water faucet to check any leak in the system.
  • Once you are sure there aren’t any leaks, switch on the power supplies and set the desired temperature in the thermostat.

 Your tankless water heater should be good to go now. In case of any deterioration or below par performance, contact the product support team. Few people have question like Are Tankless water heaters more energy efficient compare to Tank Water heater? Then read here. Check 50 gallon electric tankless water heater reviews here.

Are tankless water heaters more energy efficient?

Are Tankless water heaters more energy efficient compare to Tank Water heater?

There are always apprehensions when we move to newer and updated technology. And it’s no different when we tell people to upgrade to tankless water heaters.

When we suggest tankless water heaters to our friends and readers, the first question that comes up is regarding the price and savings they offer. And this prompted us to write this article where we decode the myth surrounding the energy efficiency of tankless water heaters.

The tankless water heaters are also referred to as “on-demand” water heaters for a reason. That’s because they are smart enough to heat water only when the faucet is opened. This vastly reduces the stand-by heat loss which is very high in conventional storage water heaters.


Check Rheem tankless water heater reviews for this year.


A lot of energy gets wasted in the process of heating and re-heating in a conventional tank style water heater. And this results in 30% less energy efficiency when compared to a tankless water heater. The energy efficiency of tank style water heaters reduces with time due to sediment build-up that is negligible in tankless water heaters.

Although the initial setting up cost of tankless water heaters are high you are sure to reap the benefits of their energy efficiency and durability in the long run. Speaking of energy efficiency, Bosch Greentherm C1050 with an Energy Factor of 0.95 and very high thermal efficiency is one of the most energy efficient tankless water heaters available.

Final verdict:

So, we can conclude that Tankess Water Heaters are more energy efficient than conventional water heaters and are the go-to option when you are planning for long-term usage. Also please keep in mind that the energy efficiency of these heaters tends to slightly decrease with time due to mineral sediments in the heating chamber. So, see to that you do a regular cleaning of the heater. If you have question like how to clean a tankless water heater then must see our post on this.

 

How does a tankless water heater work?

Tankless water heaters as the name suggests are basically water heaters without a storage tank. Also called as instant or demand-based water heaters heat and provide hot water as and when required, thus reducing standby heat loss and reducing energy bills. So a let’s take a look how exactly these modern water heaters work.

As the tankless water heaters don’t have a storage tank of their own they are directly connected to a cold water source of the house. Once the water flows into the heater, a flow sensor activates the gas burner or electric element which warm the heat exchanger unit. The incoming cold water goes over the heat exchanger and leaves the heater through the outlet as hot water. The temperature of the hot water is controlled by the heat exchanger which is in turn controlled by the thermostat.

The basic working principle of electric powered tankless water heater and gas powered tankless water heaters are the same, and only the power source and heating elements vary. There is additional exhaust vents provided for the gas based tankless water heaters.

We see that the tankless water heater starts functioning only when there is water flow in the pipeline and it is this particular feature of that makes them highly energy efficient. And continuous supply of hot water is ensured. A typical gas tankless water heater would have an output flow rate of 6-8 gallons of water per minute. This would be ideal for a shower or a faucet. But when you would want hot water at multiple points say bathroom, kitchen, washing machine etc. the output of the heater will not be sufficient. In such cases, we suggest going for two parallel heaters to match the load.