Hello Peter,
Quietside has developed a gas tankless water heater especially to use solar preheat. It condensing, 90% efficient, and uses a dual gas valve to achieve an amazing 6.7 to 1 modulation range. It uses PVC Flues, can be set up for propane or NG. We have been using Quietside products now for 5 years, and they have been very reliable. What I use for solar water heating is the TCT Progressive Tube solar water heater with the Quietside On Demand Water (ODW) 120, in the middle of their product range. Since we have started using the ODW we have no callbacks and no complaints. We also use the D'mand hot water circulation system to accelerate hot water to the back bathroom and save water. The three products work seamlessly together.

cul deant



Peter Parrish wrote:

We do a few SDHW systems and only for customers that purchase a PV system from us and want SDHW as well. We want to recommend a tankless heater where it makes sense (very old gas hot water heater or we need the space to swap out the existing gas water heater for the solar storage tank, new construction, etc.).

 

I went to a seminar on the subject a few years ago and one of the key issues was choosing a tankless heater that “modulates on input water temperature”. The only one I was aware of at the time was a small Bosch system with ½ Cu lines. Are there big fellows that “modulates on input water temperature” and could someone recommend one?  

 

- Peter

Peter T. Parrish, President
California Solar Engineering, Inc.
820 Cynthia Ave., Los Angeles, CA 90065
Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885
CA Lic. 854779, NABCEP Cert. 031806-26
[EMAIL PROTECTED]


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