In my home I have an oil fired boiler with a summer/winter hookup for hot water. Heats from 55 degrees to 160 in just 3 minutes. Never run out of hot water with this and the first system lasted 35 years before I replaced it.

Gary cool
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)