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Posted by Heatpro on November 13, 2005 at 19:41:00:
In Reply to: Re: Takagi tankless water heater in leui of boiler posted by joe bellow on November 11, 2005 at 09:01:26:
There are no inherent risks in the Takagi; the inherent risks are in the brain of the installer. A flame that runs for 2 hours will do no more damage than if it runs 24 hours, as long as there is enough water flowing through the unit. If there is not enough flow through the unit the unit would definitely heat the water - probably flashing it to steam and/or burning a tube.
The installer's problem is to have 10 gpm of water flowing through a system with 100,000 btuh of radiation at all times if the output of a copper-tube boiler is 100,000 btuh. Too many installers think they can install a 100,000 btuh boiler and have it feed 4 zones, so only one zone with 15,000 btuh of radiation can be open. That would mean that 85,000 btuh of heat has no place to go at that time, so the boiler would flash water to steam, hammer, and could break. Installers of cast-iron and steel boilers with some significant water volume inside their boiler will affect the high limit after a few minutes. Oversizing a copper-tube boiler with one gallon of water in it means instant overheat.
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