Boiler Undersized for the Property
Heating and hot water compete, showers weaken when radiators run, and the house never quite keeps up in cold weather..
Heating and hot water compete, showers weaken when radiators run, and the house never quite keeps up in cold weather.
What is actually going on
Heating and hot water compete, showers weaken when radiators run, and the house never quite keeps up in cold weather.
The realistic causes, in order
An extension, loft conversion or additional bathroom added since the boiler was installed A combi chosen on price rather than on a heat loss and hot water demand calculation Radiators added over the years without revisiting the appliance's output
What we test on site
Room-by-room heat loss calculation for the property as it is now Simultaneous hot water demand across the outlets you actually use Incoming mains flow rate, which sets the ceiling on any combi option
What you can safely look at with a boiler that's too small for the house
- List how many bathrooms and outlets get used at the same time
- Note whether the problem started after building work
- Bigger is not automatically better. An oversized boiler short cycles and wastes gas; the right answer comes from a calculation, not a rule of thumb.
Who does the work
- Gas Safe registered engineers — registration 554328
- Worcester Bosch accredited installer
- John The Plumb Ltd, company registration 10026483
Get a boiler that's too small for the house diagnosed properly
Where a change is justified, 0% finance is available on boiler installations and we size the system to your property properly first.
Questions we get asked
What causes a boiler that's too small for the house on a gas boiler?
An extension, loft conversion or additional bathroom added since the boiler was installed
What normally puts a boiler that's too small for the house right?
Where a change is justified, 0% finance is available on boiler installations and we size the system to your property properly first.
Is it safe to keep using the system with a boiler that's too small for the house?
Bigger is not automatically better. An oversized boiler short cycles and wastes gas; the right answer comes from a calculation, not a rule of thumb.