On Mon, 25 Jan 2021 08:30:16 +0000, Chris Hogg wrote:

On Mon, 25 Jan 2021 02:16:30 -0600, Alan wrote:

On Sun, 24 Jan 2021 17:43:54 +0000, thescullster wrote:

Does anyone know whether heating system "design" is regulated for
new builds in any way?


Through Gassafe and the Boilers Manufacturers Warranty.

The Housebuilders will have very little input on what the Heating people
put in.It will be a sub contractor who does the heating work, and they
will have that Contract through being the cheapest Tender. All the
Housebuilder will demand is a radiator in each room and a boiler to give
the correct heating characteristics for the house. They will not check
the designs.

I understand that the heating engineer does a calculation taking into
account the room sizes, outside wall areas etc, to work out the number
and sizes of the radiators needed and hence the boiler capacity. There
are probably formulae on boiler or radiator mfrs web sites for doing it.
From what the OP was asking, that formula ought to include the
temperature that the boiler is set to, or do the formulae just assume a
value, such as 65C or whatever?

I very much doubt that there are any calculations done regarding boiler
feed and return temperatures compared to the room sizes and a standard
temperature for that room.
They'll just see a 3 metre square room, think 'we'll need a 600btu
radiator for that room' and that is as far as the calculations will go.