On 12/01/2019 00:59, RJH wrote:
On 11/01/2019 23:33, Max Demian wrote:
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"

The instruction manual for my Ideal says that the 'e' setting is best
for condensing, which is quite hot. I don't understand this as I would
have thought that the cooler the returning water temperature the more
condensing.

My understanding of the 'e' mark on my Ideal boiler's central heating
temperature control is that any setting above is non-condensing. Any
setting below and the boiler's condensing.

That was my 'understanding', but not what was stated in the admittedly
dumbed down instructions, which talked about the startup procedure as
"lighting the boiler", as if it has a pilot light rather than igniting
the gas as required.

--
Max Demian