Thursday, January 17, 2019
1 800 317 9054

Solar water tanks for use in a residential application are completely different that a regular hot water tank and are a very important part of a properly designed residential solar water heating system. The primary purpose of a residential solar water tank is to provide thermal storage for the solar energy. This is very similar to a battery in a solar PV system.

In the past DIY'er converted a regular tank to a storage tank by using the drain ports and the T&P valve port as opening and then running an external heat exchanger on the tank. This was primitive and still left lots of issues such as thermos-ports to measure the temperature. Also playing with the position of the T&P valve is against CSA and UL codes making the system potentially dangerous.

Internal heat exchanger:

A proper residential solar water tank has the heat exchanger built internally to give the best possible heat exchange as it is directly inside the potable water. The insulation in a solar storage tank is also better than most standard water tanks as the tank may need to store the energy for days when it is not sunny. Another distinct feature of a solar water tank is direct thermos ports inside the tank. This allows the solar controller to accurately measure the water temperature inside the system. Our SolarStor tanks have both a top and bottom thermo-port for two sensors.

Single coil or double coil?

coilIf you just plan to do solar domestic hot water then all you will need is a single bottom heat exchanger coil in your residential tank. However if you plan to add a second heating zone in the future then you should plan on a top heat exchanger as well as the bottom. The top heat exchanger does the opposite of the bottom, it removes heat from the hot water and delivers it to a second heating zone as needed such as a hot tub, pool, hydronic floor heat or an air handler in the forced air furnace.

Sizes of residential solar water tanks:

All UL and CSA certified tanks have a maximum listing of 120 gallons for residential applications. That is generally large enough for a family of 8 person and can be added to a 3 collector solar heating system. If you want to go larger the solution is to by a larger commercial solar tanks which generally comes with a hefty price and often will not fit through a standard 32" door way. However to gain more storage you can combine multiple storage tanks to form a larger "bank of batteries" adding them in parallel will give you a cost effective means to doubling the storage capacity for applications requiring more heat energy such as space heating.

Warranty - All our residential tanks come with a 7 year residential warranty

Where to Buy - Visit our online store to buy solar water tanks


Dual Heat Exchanger     Single Heat Exchanger

Dual Heat Exchanger            Single Heat Exchanger

Free Solar Heating Simulations

Free Solar Heating Simulations

Click here to get a  FREE Solar Heating Simulation  

Request More Information

Email *
Zip Code: *
Solar Pool Heating
Solar Hot Tub Heating
Domestic Solar Water Heat
Solar Space Heat for home or shop
Commercial Solar Heating Project
Solar PV Systems (electrical)


In The News

Northern Lights Solar Solutions (NLSS) has completed a partnership deal with Canadian based Latitude 51 Solar. This partnership will allow Latitude 51 to continue its Canadian distribution of the Northern Lights Solar Thermal products. The ...


123ZeroEnergy in conjunction with Northern Lights Solar Solutions supplies the Enmax conservatory located in Calgary, AB Canada with 16 high performance solar vacuum tube collectors. The Sun Rain solar evacuated tubes are consider ...

From Kevin M. - Port Egin Ontario, solar swimming pool heating


This article is describing a large outdoor solar heated swimming pool.  As you can read from this story a single 30 tube solar collectors is helping maintain the pools ...

Good afternoon,
Our very simple solar water system has been up and running since the end of
March. Even on cloudy days it provides more than enough hot water for our
needs. We had no previous experience with solar water heating, so put this
together in ...

 Terry Fenwick, Harwood, Ontario
I installed my two 30 tube collector system in late November 2010.

My design goal was to maximize the winter heat gain to help heat water used for radiant floors and my domestic hot water. I have started ...

Stuart L - Near Ottawa
I've attached some photos. One is of 2 Latitude51 panels in a neighbour's system. The others are of my system. My heat/hot water system includes a wood boiler and 600 gallon heat storage tank shown in one photo. The tank has ...

I purchased a system last fall from Latitude51 Solar, originally thought I would need a 60 tube setup
but have found the 30 tube works just fine for me and my wife even though we have a tree shading
problem around our yard.
I have an on demand ...

 From Mike Holden, Ontario
System: 2 x 30 tube collectors, custom install for DHW and space heating.
"The great thing about solar energy, is that it is "free", the downside of solar energy, is that YOU must make a commitment, both ...

From George Skeet - High River Alberta.
System: 2 x 30 tube collectors, 2 x 70 gallon tanks.
Just a quick note to show we did put the panels we bought from you to work. To date the controller says we have produced 2200 kwh of energy. The controller ...

From Wayne Larsen - Big Bar Lake, BC
System: 4 x 30 evacuated tube solar collectors, The owner built his own house incorporating energy efficient designs and right from the beginning the plan was to incorportate solar hot water space heating into the ...

 From Doug S. - SE Calgary
System: 3 x 30 tube collectors, 80 Gallon Tank
For the last 3 and a half weeks (May 2011) we have had the panels run the tank up to 75 C but usually average 50-60 Deg C- range.

One of the reasons for this we have ...

Popular Items