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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