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Posted by HeatPro on July 30, 2007 at 20:07:29:
In Reply to: Boiler is constantly cycling on and off posted by Jake on July 30, 2007 at 14:54:17:
: Shouldn't the tank store more hot water than that?
Just a guess, but I'd think the tank stores 40 gallons.
The input of the boiler has a lot to do with it. The larger the input, the faster the boiler heats up while the water can't get out of the boiler to heat the tank fast enough while the boiler temp rises, so the result is short cycles.
I's not unusual to have a boiler twice or three times more input than is required to heat the house - just 'to make sure it can heat the house in cold weather, or so ' It doesn't have to work to hard, , and the installer's supplier had a big boiler in stock, so ' somebody got a good bargain."
It only requires 40,000 btuh to heat a tank in one hour, so a 150,000 btuh boiler would cycle several times an hour as it is almost 4 times as large as the tank requirement. the SuperStore can heat the water in 20 minutes with one cycle if the boiler exchanges only 40,000 btuh while it runs steady. In other words, a smaller input boiler would run more steadily.
Unlike pushing on the gas pedal of a Hummer, the bigger the boiler doesn't mean it gets there faster. The tank coil limits the in=put so the boiler has to go off for a while so as not to overheat.
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