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How many radiators can a 30kw boiler run?
Need to get a new boiler. I’ve got a 4-bed house with quite a few radiators. Would a 30kW boiler be good enough?
Expert Trade Answers
"30 kw boiler can run about 13 or 14 Radiators depends upon the size of radiators"
Answered on 1st Nov 2025 - Member since Oct 2025 -
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"Depending on how many bathrooms but most boilers will do 10-15 rads"
Answered on 30th Oct 2025 - Member since May 2023 -
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"Given your description: a 4-bedroom house, “quite a few radiators” — if you have, say, around 10-15 radiators, average insulation, 1-2 bathrooms, then yes a 30 kW boiler could be appropriate and might give you good performance.
However — if you have many more than that (say 15-20 radiators), or high hot water demand (multiple bathrooms/showers), or the house is large and poorly insulated — then 30 kW may be on the lower side, and you might benefit from maybe 35-40 kW output.
On the flip side, if your house is very well insulated, radiators are modest size, and you have only 1 bathroom and moderate demand — then maybe a 30 kW is even more than you need"
However — if you have many more than that (say 15-20 radiators), or high hot water demand (multiple bathrooms/showers), or the house is large and poorly insulated — then 30 kW may be on the lower side, and you might benefit from maybe 35-40 kW output.
On the flip side, if your house is very well insulated, radiators are modest size, and you have only 1 bathroom and moderate demand — then maybe a 30 kW is even more than you need"
Answered on 30th Oct 2025 - Member since Apr 2024 -
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