[quote=treehugger]Since the cost to heat a pool up may be $100-200/day depending on the time of year and it would extend our pool season, I think we are going to spend the $4,500 to “upgrade”. [/quote]
That number seems high. Is that your real number or are you guesstimating? This past July, we had relatives over for a little over a week and we went swimming everyday. We had the pool at 92 degrees and that whole month, our gas bill was $104. That’s inclusive of the water heater for the house AND all the cooking we did (our stoves are gas). If we don’t use the pool at all, our gas bill is around $18. That’s including us using the gas stove to cook 2-3 meals a day. So, it seems like your tankless water heater is probably saving you $6-12/month.
