On 11/01/2019 18:52, tim... wrote:
I had a new Combi fitted today (in the to-be-moved-to house).

Fitters told me that I should run this at 74 degrees.

Which I thought far too high, as

1) it makes the radiators too hot to touch
2) basic thermodynamics suggest that a better temperature profile will
result from having the radiators at the lower temperate for longer
period than a higher temperature for a shorter period

I tried to explain this but was met with

"The recommended temperature is required for the condenser to have any
effect"

and the completely bogus "the temperature of the water in the radiators
is set by the TRVs not the boiler temp.Â* I couldn't persuade the guy
that he was taking bollox, he played the "I'm the experience heating
engineer card and I know better than you" card.Â* ****

Anyhow, at my current house it is 55 and works perfectly well

what do you guys/galls do

tim


Electric boiler so not concerned with condenser temperature bollox,
always 100% efficient

.. Run ours at 80C normally, if really cold ramp it up to 85C on the
basis of highest coupling efficiency between rads and air. Fastest
heatup. No kids so rad temp not an issue.