Stainless Steel Tanks Are Better than Vitreous Enamel Tanks Our tanks are made of food grade stainless steel layered with a galvanized steel shell on the outside for increased strength against high pressures. Stainless steel is superior in solar water heating applications because it can handle the very high temperatures produced by solar water heaters, has excellent corrosion resistance and can handle the constant high pressure resulting from constant heating throughout the day.
Active solar water heaters utilize an antifreeze as the working fluid in the system. This fluid carries the heat collector from the sun to a tank stored in a different location. In order to exchange heat to the water within the tank, a heat exchanger is required. Our solar water tanks come with a built-in copper heat exchanger, so the working fluid can simply pass through the coil, thus heating the water inside.
If a tank without a built-in heat exchanger is to be used, an external heat exchanger must be utilized to exchange the heat to the water. This will also require a 2nd circulation pump, as the water inside of the tank will need to circulate through the heat exchanger and back into the tank in order to collect heat from the working fluid, which is also circulating through the heat exchanger. Use of a solar water heater tank with a built-in heat exchanger minimizes needed parts to successfully operate a system and reduces heat loss to the outside environment.
Our tanks are made of food grade stainless steel layered with a galvanized steel shell on the outside for increased strength against high pressures. Stainless steel is superior in solar water heating applications because it can handle the very high temperatures produced by solar water heaters, has excellent corrosion resistance and can handle the constant high pressure resulting from constant heating throughout the day.
Vitreous enamel tanks are made of carbon steel and utilize a glass lining to protect the steel from corrosion. Unfortunately, these cheaper style tanks cannot handle the constant pressure in solar water heater systems. When the water temperature rises to 70°C or greater, which is typical for a solar water heater system, there is high risk of cracking of the glass lining due to excessive expansion and sticking to the carbon steel. Once cracks have formed, the carbon steel may rapidly corrode due to exposure to the water, which often results in premature failure.
Every tank comes with a copper coil in the bottom of the tank for heating by the solar loop. The coil extends from where the ports enter and down to the bottom of the tank so that the entire tank of water can be heated fully by the solar loop.
Dual coil tanks come with a 2nd coil installed on the top. This coil can be used for many different things, separate from the solar system. Some examples include:
1. If a user has a a boiler, the working fluid can pass through this coil as backup heating of the tank when temperatures run below the minimum temperature.
2. The top coil can be used for recovery of heat for another system such as radiant floor heating or a radiator somewhere else in the system where using the solar loop fluid directly in the radiator is not preferred.
All tanks come equipped with a 220/240v electric backup heating element. The element is not UL listed. The tank comes with a standard screw-in 1″ port which accepts most standard water heating elements. Should the user wish to install a different heating element, it can easily be swapped out. The tank has a built-in thermostat for operation of the element independent of the solar system. The maximum amperage this thermostat can handle is 25 amps. The maximum the on/off switch on the element housing is 16 amps. If a higher amperage is to be used, simply do not wire to the switch and only use the thermostat and your household breaker for turning the element’s power off or on.
Mobile: +86 180 0660 1051
Inquiry E-Mail: firstname.lastname@example.org
You can contact us any way that is convenient for you. We are available 24/7 via fax, email or telephone.