So, you’ve chosen the right type of boiler for your property. But that’s the first stage. The next one is to think about the size of your boiler.

We don’t mean the physical dimensions of a boiler. We mean its energy output given of with the boiler’s heat, measured in kilowatts (kw).

What happens if I oversize? Isn’t bigger better?

There’s always the temptation to make sure you have an abundant supply of water. But in this case, bigger is definitely not better.

When the showers, baths and radiators are not in use, the boiler switches itself off, being too big to manage the demand. That means that your hot water taps won’t work properly. And that your energy will soar even higher than they already are.

And, on the flip side, a boiler that’s too small won’t be able to heat up your water properly. It’ll mean plenty of complaints from your family and ultimately more money spent on a good-sized replacement.

How do I know what size I need?

One way to get an idea of this is to count your radiators. The more radiators you have giving off heat, the bigger the size will need to be.

Here’s a general guide:

Number of radiators Combi boiler System boiler Conventional Boiler
0-10 9-18 Kw 9-18 Kw 24 – 27 Kw
10-15 18-26 Kw 18-26 Kw 28 -34 Kw
15-20 26-40 Kw 26-40 Kw 35 – 42 Kw

Is insulation a factor too?

It’s estimated that 35% of heat escapes through the walls and 25% through the roof. So yes, if your walls and roof aren’t very well insulated (which is likely if your home was built before 1990), you will need to compensate for the lost heat. For your boiler to really keep you warm, you will have to take your wall’s insulation- or lack thereof- into consideration.

Are there any other factors that I may want to consider?

If you plan on extending in the near future, your size and type will have to accommodate any additional radiators or toilets. In the long run, a larger boiler might save you time and money, even if it costs you more right now.

Aside from size and type, what other factors to consider?

There are also boiler warranties to think about. If something goes wrong, you want to be covered to have them repaired. Most brands offer anything from 1-10 years, so make sure to do your homework.

In all cases, it’s recommended that you get a professional opinion. Input from someone with experience and qualifications who will give you honest advice based on your home and needs. They’ll know what’s out there on the market and what’s best for you.

We’re always happy to help with any of your boiler needs. Reach out for a free quote.

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