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Island-Ho · 05-07-2009, 01:24 PM

I would hope that the unit is designed so that a very high percentage of that 200K BTU goes into heating the water and that there is very little wasted to recover for space heating, although you might get a little out of the vent flue.
I am considering using a tankless heater downstream from a solar hot water system. Does anyone know if the Rinnia fires up based on incoming water temperature or simply turns on when the water starts flowing? Obviously the second scenario would be undesirable if the incoming water is already hot enough! Currently my solar heated water flows into a backup gas fired water heater, but I would like to eliminate having to keep that tank warm all the time when there is plenty of solar heated water available.

05-07-2009, 01:24 PM	#18
Island-Ho Senior Member Join Date: Apr 2004 Posts: 178 Thanks: 19 Thanked 14 Times in 11 Posts	Comment & Question I would hope that the unit is designed so that a very high percentage of that 200K BTU goes into heating the water and that there is very little wasted to recover for space heating, although you might get a little out of the vent flue. I am considering using a tankless heater downstream from a solar hot water system. Does anyone know if the Rinnia fires up based on incoming water temperature or simply turns on when the water starts flowing? Obviously the second scenario would be undesirable if the incoming water is already hot enough! Currently my solar heated water flows into a backup gas fired water heater, but I would like to eliminate having to keep that tank warm all the time when there is plenty of solar heated water available.