Is my boiler sufficient for my 15 rads
- Thread starter kareni
- Start date
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More than likely. It's a combi boiler, so it needs all 26Kw to heat the water used by the bath, shower etc.
The requirement for central heating is usually much less than this - you can check this by using the Whole House Boiler Size Calculator. Set the Domestic Hot Water Allowance to zero as you have a combi boiler.
If you want to find out how much heat your rads give off, use the Stelrad Elite Catalogue
Don't forget that a combi boiler can either heat the house or heat the water; it can't do both at the same time.
No combis heat the heating at the same time as hot water.
If you have the heating on and then run a bath, all the time the bath is running the heating will be off. Its only running hot water for 10 mininutes or so and the radiators will barely cool down in that time and you dont actually notice the heating not working when hot water is running.
Hope that makes sense
If you have the heating on and then run a bath, all the time the bath is running the heating will be off. Its only running hot water for 10 mininutes or so and the radiators will barely cool down in that time and you dont actually notice the heating not working when hot water is running.
Hope that makes sense
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Yes although I would think it will struggle with supplying 3 bathrooms
at the same time. If you imagine a morning routine with 6 people
all going into the bathroom running baths and showers between 7 and 8 am.
Will mean the heating remains off for quite a bit of that time.
If you find it struggling with the hot water supply you can add a cylinder heated by the combi to supply a bathroom or two.
at the same time. If you imagine a morning routine with 6 people
all going into the bathroom running baths and showers between 7 and 8 am.
Will mean the heating remains off for quite a bit of that time.
If you find it struggling with the hot water supply you can add a cylinder heated by the combi to supply a bathroom or two.
I missed the bit about three bathrooms; my reply really applies to the central heating side.
A 26kW boiler will struggle to supply water to three baths or showers at the same time. This is because it will only be able to provide a total flow rate of about 11 litres a minute. A single shower will take a t least 10 litres/min.
Did you have the boiler installed? If so, who specified the size and did they measure the cold water flow rate before saying that a combi would be suitable?
Not quite that bad Dave, it does have a 32Ltr store so can knock out around 15 ltrs/min at 50c
meant to say have they installed a larger expansion vessel, the one with the boiler is unlikely to be anywhere near large enough for a 15 rad system.
meant to say have they installed a larger expansion vessel, the one with the boiler is unlikely to be anywhere near large enough for a 15 rad system.
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