Large Volume Solar Tanks

There are many solar thermal applications where higher volumes of water storage is required.  In fact, the more storage, the better the solar system will function.  Niles Steel Tank has developed large volume storage tanks coupled with internal 1 1/2” O.D. heating coils.  Each coil has 14.2 sq./ ft. of heating surface designed for slower gpm rates which solar systems operate.  Our internal coils are single wall coils and can be positioned in almost any configuration in the tank.  Depending on the diameter and height of the tank we can pack each tank with as much heating surface that is physically possible.  By utilizing multiple coils, different solar panel placement designs can be realized.  Morning or afternoon sun can be captured, back-up systems can be refined and you can capture more of the sun’s energy and design a “smarter” tank.  Multiple coils would allow for modular heating zones within the tank.  As demand increase or decreases, more coils can be “turned on” or “off” based on the load.

Our Large Volume Solar Tanks have also been used in conjunction with boilers to create a very large almost instantaneous water heaters.  In today’s world of modulating boilers and demand for high efficiencies, saving money is the goal.  By utilizing multiple coils in the tank, each coil becomes a separate heating “zone” which produces more efficient firing rates and faster heating capabilities.


How to order:
For quote generation, all we need to know is the tank size, number of coils, insulation or not.

  • Start by selecting the tank for the project. Consider door openings and ceiling heights.
  • Refer to our coil chart below to see how many coils will fit into your tank. You can tell us where to place the coils later and we’ll do a sign-off drawing for you.
  • Determine if you would like the tank to be topcoated with R-16 spray on insulation. Consider door openings and ceiling heights. Topcoat will add approximately 6” to the diameter and 3” to the overall height of the tank.
  • Please check our solar calculator which will help you see if what you have chosen will produce your desired results. The calculator will not tell you what to use. It will tell you the results of what you have chosen.

Model Number explained
SR-42-084-4-TC
(SR) = Solar Tank
(42) = Diameter
(084) = Tank height (Less base ring), add base ring for total height.
(4) = number of coils
(TC) = Topcoat Insulation (optional)

Model_Number Gal. Max# of_coils
SR-30-063-X 175 1
SR-30-075-X 210 2
SR-30-085-X 240 2
SR-36-078-X 310 4
SR-36-085-X 340 4
SR-36-090-X 360 4
SR-42-084-X 453 6
SR-42-093-X 505 6
SR-42-105-X 575 9
SR-48-073-X 500 5
SR-48-096-X 675 10
SR-48-108-X 765 10
SR-48-141-X 1040 15