Copied from my post a few months back...
We also installed a propane-fired tankless heater and I love it. Water is very hot and we've never run out -- even with multiple simultaneous showers.
The builder recommended we go tankless and the cost differential over a propane fired hot water heater was only $170. Interestingly, when we tried to estimate what level we ought to be for propane pricing (per the deal with Our Town and Eastern propane) -- this being our first year with a new house -- the customer service rep commented that the Rinnai Tankless is very efficient and hardly enters their calculus. On the downside, every single time the hot water is turned on at the faucet for even a moment, the tankless fires up and you can hear it in certain areas of the home -- I'm sure I'm the only one that notices...
I do notice a delay, but it's really not that long, maybe 30 sec?
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