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Posted by Dave on February 01, 2005 at 15:07:40:
In Reply to: Re: Condensing vs Non-Condensing Gas Boilers posted by Pat S on February 01, 2005 at 12:57:48:
: Just to clarify - a cold start still requires the boiler to maintain its low limit temperature? or does it literally shut off until there is a call for DHW heating?
** Yes- it shuts completely off.
: Any idea what the condensing boilers efficiencies are when the HWR temps are above condensing high limit?
** I would say in the mid to high 80's.
: Are condensing boilers the only ones that are cold start? And doesn't cold starting create problems with condensation in the boiler - leading to decreased life? Do SS or Al heat exchangers in cold start boilers help diminish condensation concerns?
** well typically they are cold start. CI boilers take a while to get up to temp and you could lose out on your hot water production. A modulating condensing boiler is made to withstand condensation.
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