Advanced Thermal Solar, LLC

METHOD 1  Preheats stored water using an indirect water heater, this water is used to supply the existing water heater with heated "make-up" water.

One great way of connecting your new solar hot water system into your existing hot water system is the Hybrid closed loop Solar system shown above, which works with your existing water heater, the domestic hot water (DHW) coil in your boiler and instant (tankless units) that have an incoming water temperature probe. This method will double your stored water capacity and because your existing sytem is running when the solar tank temperature drops below 120F you always have ample hot water.

There are two options installation options to consider when installing a hybrid closed loop solar DHW system. Option one would use an indirect water heater like the SuperStor Ultra Tank which includes an internal heat exchanger, the closed loop of solar heated (food grade) glycol warms up the water stored in the solar stoarge tank, as shown in the detail.


METHOD 2  Preheats stored using a solar storage tank and an exchanger, this water is used to supply the existing water heater with heated "make-up" water.

This option would incorporate a solar storage tank which could even consist of a lower cost electric water heater (electric coil is not used) as shown in the other detail. This system would require a small bronze pump and a flat plate exchanger which we can size for your application.

A Hybrid Closed loop DHW system uses solar energy to preheat the make-up water that normally goes into your existing water heater. This keeps the water heater hot when you use hot water until the water in your solar storage tank starts to cool off. During the summer your hot water cost is almost free and your capacity (storage of hot water) is typically double since you now have two tanks of hot water to use. The existing hot water heater still uses some fuel or electricity to maintain the hot water, but the fuel consumption is reduced greatly because the thermal loading is reduced.

Adding warm or hot water to your hot water heater instead of very cold water can also prevent the thermal damage (crazing) that occurs sometimes to glass lined water heaters when cold water hits a hot glass lined surface. Crazing is a network of fine cracks inside a surface or glaze of a surface.

If you are using a DHW coil on your boiler to produce hot water, the system simply ties into the cold water feed for the hot-water coil. The boiler will work much less because adding hot water into the coil will actually warm up the boiler during the summer months when the boiler temperature is typically lowered.


Warning: Whenever domestic hot water is getting heated by an exchanger in a closed system only non-toxic antifreeze solutions should be used in the transfer fluid; look into Cryo-Tec, DowFrost, Xceltherm CE, Corn Glycol, and Dynalene Solar Glycol 50 for various fluid options.


Advanced Thermal Solar (ATS) offers products that may require professional installation. (ATS) recommends hiring a HVAC professional trained in the service and repair of HVAC/R appliances. Parts sold by (ATS) may require specialized tools and/or procedures for safe and reliable operation of the effected systems. Buyer(s) specifically holds (ATS) harmless for injury, property damage, or other losses associated with the use of items purchased from (ATS). It is not the intention of (ATS) to encourage the servicing of HVAC/R appliances by untrained personnel, rather to "allow the public to purchase the necessary parts directly" for use by trained and/or licensed professionals.


Always use tempering valve to prevent possible scalding when using any kind of a solar hot water system since temperatures can often exceed 120F. 


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