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Thank you PrenticeBoyofDerry. So I need to lift the lead flashing at the top of the roof pitch first? This would have been the last row of tiles to have been fixed - so the fixings holding them in place would be readliy accessible? Just checking that I've got this straight. Dave

Merci mointainwalker You have been following the discussion I take it? Dave

Ok Tony, You've convinced me. Thanks for all of your time & trouble. I am now much wiser. An 18kW boiler should do the trick. Dave BTW, the window area works out to be 13% not the 17% that sedbuk & EST assume, so this helps to convince me also :) D

Such a helpful post! Thank you :) Having spent a lot of money only 10 years ago on a new boiler, I find myself in the same position of having to replace it. Now possibly you can afford to throw money away, but I want to make sure that this time the money gets spent wisely. The only...

Just looking at the EST and sedbuk calculations again. EST Calculator reckons 15kW boiler is required, sedbuk says 18kW Sedbuk calculation makes a 2kW allowance for hot water whereas the EST calculation does not? These both assume a window area of 17% of wall area? EDIT: Actual...

Sorry Tony if it appears that I'm going against advice, just don't want to screw up by finding that the boiler can't cope with extremes of temperature. Made a BIG mistake last time getting the Ideal Minimiser - what a DOG that turned out to be! Trouble was, 11 years ago, there didn't seem to...

Hi, Quite a competent DIY'er, but have never tackled roofs before. Problem is that there is little or no insulation below the pitched roof of my wooden bay window. I'd like to put some Rockwool up there as the bay is quite cold with a noticeable draught coming through the down-lighters...

Hi, I have a 2-storey wooden bay window with exterior overlapped cedar cladding. I suspect that there is little (or no) insulation between the exterior cladding and the internal plasterboard although there is a waterproof membrane. Any idea where I can get dark "wood effect" uPVC...

That's OK DH, 'twas easily overlooked. We have had several occasions over the past few years where the temp has been down to -5 to -8˚C, so I think that I'd prefer to go with a 24kW boiler then for "insurance" because my elderly mother lives with us and she feels the cold terribly...

So if the outside tempetaure is lower than -1˚C, the boiler will not be able to maintain the internal temperature? Errr.... Not at the moment. The boiler is broken and we have been without heating & hot water since 9pm last Wednesday evening (30th Dec). 3x 2kW electric convector...

Thank you both. You seem to be agreed that an 18kW boiler should suffice - we'll see if British Gas agree! So, I'm looking at 1) Worcester Bosch Greenstar 18i (or 30 CDi System Boiler) 2) Vaillant ecoTech plus 618 System boiler or the 3) Borag Remeha Avanta Plus 18s System...

Thanks Tony, So, I should go with the figures from sedbuk and/or EST calculator ie 15-18 kW? Coincidentally, I've just recalculated the "best guess" radiator load and it comes out at 17.75kW So, if I factor in say 2kW for water heating that gives me just under 20kW. Therefore...

Thanks for the input guys. This 14.8kW figure is what I get from sedbuk too. The house is fully-double glazed, has cavity wall insulation and a minimum of 100mm rockwool loft insulation and about 1/4 of the loft has 180mm of rockwool. By "the original boiler" I presume you mean the one...

Hi Tony As far as estimating the radiator outputs went, I took the base data from the Stelrad site. I looked at their K2 radiators for those that are double & finned and took their output directly when I had the correct size. For the older (imperial-sized) radiators (which are mostly...

Everything to do with gas central heating!

Hi there Sheffield, S.Yorkshire Searched for local WB installers & came up with these: Dave

Thank you D_Hailsham for all of your help today. I did take note of the warning at the top of the database "Small differences in the calculated SAP seasonal efficiency values are not significant and should not be relied on when comparing boilers." but thanks for pointing out that small...

Is this a general finding of the engineers/installers on this forum? What about the customer service and servicing of Broag Remeha Avanta boilers in comparison? I seem to have compiled a shortlist of 4 boilers to consider: Worcester Bosch Greenstar 30CDi (or the 24i System boiler) -...

Hmmm.... ... that's a point to condider to be sure! Dave