Discuss 30Kw v 35Kw running costs in the Plumbing Jobs | The Job-board area at PlumbersForums.net
I think you get a flavour of the problems on the heating side from what has been posted so far (most combination boilers can be adjusted down for the heating) as far as the hot water is concerned you pays your money & takes your choice, the extra 5kW's will not effect the efficiency too much, but I would be checking with your plumber how much it will be costing to up-rate your gas supply to the new boiler & wether your mains water supply will provide the boiler's stated flow rates (which could be used to calculate how long it will take to fill your bath). Me personally, I would not be fitting a combi into a property such as yours, I prefer to store my hot water, IMHO combi's are only suitable for smaller houses & flats.Yes it will be a wall mounted combi, I would hate to settle for the smaller output if at some stage later I found that it was a bit slow to fill the bath, that's why I asked the question really.
I was recommended a 30Kw some months ago but just want to be sure.
I think you get a flavour of the problems on the heating side from what has been posted so far (most combination boilers can be adjusted down for the heating) as far as the hot water is concerned you pays your money & takes your choice, the extra 5kW's will not effect the efficiency too much, but I would be checking with your plumber how much it will be costing to up-rate your gas supply to the new boiler & wether your mains water supply will provide the boiler's stated flow rates (which could be used to calculate how long it will take to fill your bath). Me personally, I would not be fitting a combi into a property such as yours, I prefer to store my hot water, IMHO combi's are only suitable for smaller houses & flats.
What do you class as slow and how big is the bath? The true answer is there somewhere. As already said, take into consideration the minimum output of the boiler for heating. when you have a small heat load after half the radiator valves have shut down you may find the boiler even at minimum burn cannot dissipate the heat provided quick enough.
Yes I see what you mean about the heating, it just comes back to the bath filling thing then
Where is the new boiler going to be located? If out if sight you could try a Vaillant 937 which has an inbuilt 15l storage tank which really improves HW delivery and performance.
Interesting, just checked it out but probably a bit too bulky to go on the wall in the utility room. I've seen a couple of comments on the forum suggesting that combis are not necessarily the best choice these days. Is there an alternative?
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