Boilers
What Size Boiler Do I Need? A Homeowner’s Guide
Why Boiler Size MattersWhat Factors Affect Boiler Size?Typical Boiler Size GuideShould You Choose a Combi or System Boiler?When to Call an ExpertGet Your Boiler Sized Properly
Choosing the right size boiler is essential for keeping your home warm, energy-efficient, and future-proof. Too small, and it won’t keep up with demand. Too big, and you’ll waste energy and money.
At Pleasant Plumbers, we help homeowners across London find the perfect boiler size for their property—whether you’re replacing an outdated unit or planning a full upgrade. Here’s everything you need to know.
“Boiler size” refers to output power in kilowatts (kW)—not the physical size. Choosing the right output ensures:
More bedrooms typically means more radiators and water usage.
More bathrooms = higher hot water demand. Homes with multiple showers may need higher kW.
Flats require less power than large detached homes.
Families with high usage (e.g. baths, multiple occupants) may need a larger boiler or a system with a hot water cylinder.
Well-insulated homes retain heat better and may need a lower-output boiler.
If your household has high hot water usage or more than two bathrooms, it may be better to opt for a system boiler with a separate hot water cylinder for greater capacity and flow rate.
Boiler sizing is too important to guess. At Pleasant Plumbers, we assess your property, usage, pipework, and future plans before recommending the right system.
We install, repair, and service boilers across London—quickly, efficiently, and with honest advice.
📲 Call or WhatsApp 0800 046 1000
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🌐 Visit pleasantplumbers.com
Searching 'Plumber Near Me?' Plumber London or Commercial Plumber London? We operate all across London! If you need a trusted plumber in London then get in touch with us today on 0800 046 1000 or email us on [email protected]
Pleasant Plumbers – Where Trust Flows Like Water.