Part of the geothermal project is replacement of the natural draft gas fired 40 gallon water heater. This eliminated a flue out of the basement chimney. The replacement will be a 40 gallon heater with a heat exchanger from the geothermal loop, and a Rinnai tankless gas fired water heater for supplemental heat. The gas boiler and storage water heater have been removed from the basement. We get our hot water from the tankless water heater. I had some discussion with the contractor about using a 95% tankless water heater, but their concern was that it was a maintenance item. I also verified that with another plumber I knew. And we went with the Rinnai, made in Japan. It is listed as 83% efficient. However, the unit has air from the outside, and turns off when not in use. The water outlet temperature is set at 120 deg. F. It has worked well, with a constant supply temperature when showering or bathing. The heater is listed as Energy Star Qualified, it is the R75LSi model. Connections are a 3/4" gas line and 3/4" hot and cold water lines.
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