I have a 'batch' solar hot water tank on my roof I put in when I built the house in 1990.It preheats the water before it goes into a water heater, and previously I had an LP gas heater, a 40 gallon tank.That system worked well, but four years ago I did an addition and put in a Bosch solar type tankless heater designed to back up the solar hot water.It works very well, sensing the temperature of the water coming from the roof and firing up only as needed to increase the temperature if the water from the batch heater isn't hot enough.While it works perfectly there are two concerns.One is that the solar unit has a standing pilot light rather than electronic ignition; I believe they could figure out how to fix this.Secondly, the unit is small and if someone upstairs calls for hot water while I am in the shower the water gets cold until I adjust the mix, then the water is hot enough.This heater will not work for a large family, though putting in two might work.It has saved a lot of money in LP gas, and I have noticed the reduction since putting in the Bosch compared to the previous method.I can't say how much because I used to use LP gas to cook and when I did the addition we switched to an electric stove, so the gas use would have been reduced anyway.Still, I use very little LP gas on a yearly basis, only 200-300 gallons for home heating and water heating for a 2700 sq. ft. house; not bad!Click Here to see more reviews about: Bosch 1600PS LP Aquastar 4.7 GPM Indoor Solar Whole-House Tankless Liquid Propane Water Heater
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Includes 1600PS (Solar Standing Pilot) Liquid Propane Gas Tankless Water Heater - 1600PS-LP
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