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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

Thanks again Whitespirit This looks like I get the boiler direct & then get someone (CORGI registered of course) to fit it for me? Is that what you are suggesting? Dave

Hi again D_Hailsham Have done quite a bit of maths working out the radiator outputs due to the age of the system (25+ years) as the Stelrad link you gave me only has a few similar products. The figures below represent my "best educated guess". Most of the original radiators are double...

Hi Tony Do I gather from your post that you DO install boilers? If that is the case, what advice or comments can you offer on: a) Worcester Bosch Greenstar 30 CDi (or 24i System boilers) b) Vaillant ecoTech plus 600 series (probably the 624 System boiler) and c) Remeha Avanta...

Cheers Whitespirit In your original reply you said: [/url] Are you saying here that they are cheaper than Vaillant? Dave

Thank you steady and Whitespirit You are the second one to put me on to Remeha Avanta. I had a look at their web brochure and they look interesting! Dave

Thank you once again D_Hailsham I'd spotted that something was wrong - probably something to do with my browser cache. When I clicked on the "Restart" button, the figures then made sense. Looking at the radiators now. Thanks also for the "heads up" on the Remeha Avanta and the link...

Thanks steady So, nothing to choose between them then (& none significantly better I guess)? Dave

UPDATE: Think I've found out what's happening! The numbers in the EST caculator don't add up! It seems that although I have changed some values, the older values are being retained. Presumably, some data is being retained in my browser cache! For example, if you look at the section...

Here is the input information: sedbuk first: EST: Same values but different result?? Dave

Hi again, Doh! I'd spotted that earlier (yesterday) but when I re-entered the figures this morning, input the values in the same order as the EST calculator. Have put in the correct figures now into the sebuk calculator and at least the wall areas agree. The boiler outputs still don't...

Hello folks. I would like some advice please as my old boiler has packed up and I'm looking at a replacement. My current boiler is an Ideal Minimiser FF80 (no, please don't laugh). Looking at either a Worcester Bosch Greenstar 30CDi or a Vaillant ecoTech plus 630 (or the 624/637 depending...