Solar Water Heater Tank - Solar Storage Tanks
SolStor Solar Water Tanks are North Americas only complete solar water tanks and are UL and CSA certified. Unlike other tank manufacturers SolStor tanks come complete with two large internal heat exchangers and a back up 4.5 Kw electric element ALL In One Tank!. This tank is suitable for all forms of solar heating systems including solar hot water heaters, solar home heating, solar pools and hot tubs! With this tank you can easily expand your solar heating system at any time without new equipment!
Solar water tanks are used in solar heating packages to act as buffer tanks.When the sun is shinning, the water will be heated in the solar storage tank for later use, most commonly in the evening. Most solar water tanks contain a heat exchanger to separate the potable water from the solar heating solution (Water/Glycol), and have a great insulation value that can retain the heat for day. The SolStor tank has a rated heat loss of less than .8 degrees F/ Hour!
There are 3 kinds of solar water tank systems used in North America:
- Solar Pre-Heat Tank
- Solar Combo Electric Tank
- Solar Dual Heat Exchanger Tank
SolarStor Water tanks are North America's Only 3-In-one solar water tanks.
3- In-One Solar Tank
Solar Pre Heat with existing heater
Solar Heater with electric back up
Solar Water with 2nd Heating zone
SolarStor tanks can offer 3 types of Heating configuration for now or Future
- Pre-heat tank for hot water heating
- Combo tank with solar and Electric
- Dual solar heating applications
Pre-heat tank for hot water heating
The 1st and most common solar heating tank configuration is a Solar pre-heat tank for hot water heating. This type of solar heating system is used in homes with an existing water heater (electric, oil, gas, tank-less). The pre-heat tank stores the solar heated hot water which is then drawn into the main tank when the hot water faucets are open. This type of system use the large 14 ft2 internal heat exchanger to heat the potable water in the tank. The pre-heat tank heats the otherwise cold ground water before it enters the normal water tank. In this way ground or main line water of approx 35 F can be preheated to say 120 + degrees before entering the primary heating tank. If the heating tank is set to 130 degrees it only needs to raise the water 10 degrees instead of the 95 degrees it would have otherwise had to with out the solar pre heat-tank.
Combo tank with solar and Electric
Dual solar heating applications
Sizing a Solar Water Tank
Solar Expansion Tanks
Another type of solar storage tank that is needed and often overlooked is an expansion tank found on the closed loop solar side of the solar heating system. All closed loop solar heating systems must have an expansion tank. Sizing of the expansion tank is very important. Northern Lights Solar Solutions has Italian manufactured Varem Solar Expansion tanks. These are the only tanks that are manufactured specifically for solar heating applications and can withstand higher temperatures than other hydronic style expansion tanks.Learn more on solar expansion tanks by clicking link.
Solar Hot Water Tank with a External Heat Exchanger
The SolarStor Series of solar tanks are an excellent choice for most solar applications. However, for those on a tight budget, there is a very affordable way to create a solar storage tank using either a new or used electric hot water tank and an external heat exchanger. Electric tanks are perfect for a solar conversion as they have all the ports you will need along with existing safety features such as a thermal pressure release valve and a build in drain valve. A average hot water tank can be purchased for $300-$500 and converted in minutes for under $10 in parts plus an external heat exchanger. To convert a hot water tank we simply remove the two heater elements which are threaded into the tank (1" thread). The top element port will become the supply for the hot water and the bottom heater element will become the draw for the colder water from the bottom portion of the tank.
In smaller systems you can allow thermalsiphon to move the water from the bottom of the tank to the top portion. Thermosiphon is the natural tendency of hot water to rise as it weighs less. As the heat exchanger heats up the potable water, the hot water will rise to the top port and draw in the colder water from the bottom port. On larger systems especially commercial, a secondary pump can be used on the storage side to circulate the water in the tank.
Below are 4 easy steps to covert an electric hot water tank. In this example we have used a heat exchanger as the winter temperatures get very cold and a 50%/50% water and glycol mixture was used in the collectors. However, if you are in a milder climate without hard freezing, water can be used and you can avoid using a heat exchanger, connecting directly to the water tank.