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Tenderloin-
At the risk of Golf Club entry, we use it to heat our pool in the summer (so - yes, hot water essentially). It's very efficient once the ambient temp is over 15°, but obv we don't use it when it's much colder than that - April/May to Oct only. Ours is a bit away from the house, but you'd want to be careful with placement for you/neighbours because it's a very definite constant noise when it's on.
villa-ru
They are quite noisy. We have one but not used for the house heating.