Our “kitchen-table” method for choosing the right boiler
We don’t start with “Worcester or Vaillant?” We start with the boring stuff that decides whether you’ll love the boiler or hate it:
how many bathrooms, what your mornings look like, whether the kitchen tap turns sad when the heating kicks in, and what the pressure feels like on a normal weekday.
Little London detail: we’ve been in plenty of places where the owner says “it’s fine” — then you turn the tap and it’s basically a polite drizzle.
That’s how people end up with the wrong combi on paper.
If you’re also choosing brand, we’ve written it up properly here:
Worcester vs Vaillant vs Ideal (honest comparison).
But type first. Brand second.
Three tiny examples we see all the time
1) Forest Gate conversion flat: one bathroom, decent pressure, boiler in a kitchen cupboard.
Combi made sense. The win wasn’t the brand — it was sizing it properly and setting it up so it didn’t short-cycle all day.
2) Family house with busy mornings: two bathrooms, “everyone showers at once” energy.
System boiler + cylinder kept things calm. Nobody wants to be the person who turned the tap and stole the hot water from upstairs.
3) Older regular setup: customer wanted a combi because it sounded modern.
Once we looked at the pressure reality + layout, keeping a stored hot water setup was the better day-to-day experience.
If you’re stuck on “repair vs replace” right now, this helps:
repair vs replace — what usually wins long-term.
FAQs (real questions, real answers)
Is a combi always cheaper to install?
Not always. A like-for-like combi swap can be straightforward, but conversions and relocations can add time and parts.
The cheapest option is usually the one that suits the property without forcing awkward changes.
We’ve got two bathrooms — does that automatically mean “system boiler”?
Not automatic, but it’s a strong hint. Two bathrooms often means you’ll appreciate stored hot water.
We’ll still check pressure and usage patterns — some homes are two-bathroom on paper but used like a one-bathroom home.
Can I switch from a regular boiler to a combi?
Often yes, but we only recommend it when it improves the day-to-day experience.
If your pressure isn’t great, a combi can feel like a downgrade even if it’s newer.
If you want examples of change pricing, see boiler change price examples in London.
Which brands do you fit for these boiler types?
We regularly install Worcester, Vaillant and Ideal across combi/system/regular setups.
Brand matters, but “matched to the home + installed properly” matters more.
If you’re stuck between brands: our comparison is here.
How do I get a recommendation without a home visit?
Call +44 7727 154 746 or send photos via
the contact form.
Photos of the boiler area, controls, and cylinder/tanks (if you have them) get us 80% of the way quickly.