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Fredxx[_3_]
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Boilers
On 02/10/2020 23:42:17, Fredxx wrote:
On 02/10/2020 23:20:46,
wrote:
On Wednesday, 30 September 2020 20:35:29 UTC+1, John SmithÂ* wrote:
On 2020-09-30 18:58:53 +0000, John Rumm said:
With modern modulating boilers that is less of a problem in the past. A
boiler with a wide modulation range is also desirable. The Vaillant
24kW models often go do to around 6kW.
John, thanks for your suggesting about the PCBs but at 20 years old I
think it's time to replace the whole thing and also it will be quicker.
maybe you could find a similar used one & swap it, but probably you won't
One possible problem regarding rating and the way new boilers work -
our gas supply pipe to the current boiler is 15mm - is this likely to
be a problem for a condensing system boiler - I know it would be for a
combi boiler. Maybe there is a ceiling on rating or some makers only
specify 22mm.
Digging up the kitchen floor is not a great option...
In most cases a 24kW boiler is not permitted to run on 15mm now,
current regs are more demanding re pressure drop. Worcester Bosch do a
pdf:
Technical Training Bulletin: Natural Gas (G20) Supply Pipe Sizing.
that explains how to calculate what's required.
Do you have a link?
I didn't think so.
I think this is far more helpful:
http://wiki.diyfaq.org.uk/index.php/Gas_pipe_sizing
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