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Default Short firing -- how short is short?

Hi,

Once an unvented central heating system is up to temperature, how often
would one expect the boiler to fire, and for how long?

Mine seems to go on and off in fairly quick cycles, although I haven't
actually sat down and measured them (it would involve sitting on the
toilet, as its inaudible from most of the house).

Thanks for any advice
- Ian

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Oxford University Library Services | F: (01865) 242287
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Default Short firing -- how short is short?


"Ian Chard" wrote in message
...
Hi,

Once an unvented central heating system is up to temperature, how often
would one expect the boiler to fire, and for how long?


Depends on the outside temperature in relation to thermostat settings. My
geriatric system goes off and on about twice per minute at -10deg C outside
and thermostats set to maximum (20c) inside. Under less onerous conditions
it might be only once in ten minutes or even less.

rusty




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Default Short firing -- how short is short?

In article ,
Ian Chard writes:
Hi,

Once an unvented central heating system is up to temperature, how often
would one expect the boiler to fire, and for how long?


This really is a "how long is a piece of string" question.

Mine seems to go on and off in fairly quick cycles, although I haven't
actually sat down and measured them (it would involve sitting on the
toilet, as its inaudible from most of the house).


If it's a non-modulating boiler, then it is designed to switch
on and off in order to reduce the heat output to match what the
radiators can dissipate.

If it is doing this when the house isn't up to the thermostat
temperature, then you will improve things by turning up the
water temperature, as this will increase the power output from
the radiators, and they will do a better job of keeping up with
the boiler output. When the house is up to temperature, you
can then knock the boiler temperature down a bit for more
efficient operation.

You might get more useful advice if you gave the boiler model
and power output.

--
Andrew Gabriel
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