On 16 Feb 2006 02:11:21 -0800, "Lunny" wrote:

Hi,

Does anyone have a copy of the Myson program? Can't find it anywhere on
t'internet.

Reason I need is that I have had a ch guy round and I think he's
oversizing everything to avoid comeback. For example about 10,000 BTU
for a 4mx2mx2.7m bedroom (2 external walls) Also suggested a 37.9kW
boiler for a 3 bed end terrace house (100 yr old). The reasoning is
that the boiler (not a combi) would not need to work as hard etc. I
understand that oversizing condensing boilers is not as much as an
issue as they are modulated but surely this is enough to heat the
neighbours house too.


If he's working in BTUs then he should be shown the door anyway.

If he's mixing BTU and kW units then the above should apply together
with a steel capped boot.

If you would like the Myson program, send me an email.

I would be surprised if 38kW were needed for this application. I
might believe 25.



I thought I'd try calculating some rooms last night. Found the formula,
and have taken into account wall sizes, windows, doors, U-values,
ventilation rate etc but it all seems on the low side the bedroom was
coming out at about 1.4Kw. As an experiment I put a 2kw electric heater
in there for 30 mins and it just managed to heat the room up.

Also labour for all fitting is £800 - resited and new boiler,
converting to a sealed S-Plan and 7 rads (one resited). Does this sound
reasonable?


Cheers!

--

..andy