On Tue, 27 Nov 2007 16:51:17 UTC, Golan wrote:

Hi.


i have a vaillant ecomax 613 condensing boiler with indirect cylinder.

at the moment the boiler thermostat is set to 65 deg and the cylinder
to 58 deg.

my question is it better to set up to boiler thermostat to max ? will
the boiler still work in condensing mode ?

It will condense better if you keep it at the lowest setting consistent
with getting the heat you require.

my gas engineer told my that the boiler is very efficient so it is OK
to run the hot water 24HR a day.

Well, no matter how efficient ist is, it's always going to be cheaper
NOT to run it 24 hours a day.

Think about it. Rate of heat loss from the cylinder is proportional to
the temperature difference between it and its surroundings. As the
cylinder cools, its heat loss slows. If you keep it hot all the time,
its heat loss will be greater. Keeping it hot thus costs more than
letting it cool, and just putting the lost heat back.

So, run the boiler only when you need to heat the cylinder. Don't heat
it at night, or during the working day when you're not there.

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