Choosing a boiler isn't like choosing a TV. You can't try it out first, and you'll be living with the decision for the next 10 to 18 years. As a Gas Safe registered team installing combi boilers across London every week, here's our honest view on what suits which home, and what's genuinely worth paying more for.
What actually decides the right boiler for you
- Property size: how many bathrooms, and how many taps might run at once.
- Water pressure: older London properties sometimes have lower incoming mains pressure, which affects which models perform well.
- Budget: both the price fitted and the length of warranty behind it.
- Where it's going: some models suit tight cupboard spaces in Victorian and Edwardian conversions better than others.
Our three packages, by home size
Rather than quote every boiler on the market, we fit three packages so you can compare on warranty and budget rather than getting lost in model numbers.
Essential from £1,695
Best forFlats and smaller homes, or if you're planning to move within a few years
- Mid-range combi boiler
- 5-year manufacturer warranty
Standard from £2,295
Best forThe right call for most homeowners staying put
- ATAG combi boiler
- 12-year manufacturer warranty
- Scale reducer fitted as standard
Premium from £2,795
Best forLongest cover for the lowest cost per month over the warranty
- Same ATAG range
- 18-year manufacturer warranty
- Lifetime warranty on the heat exchanger
- Essential, from £1,695: a mid-range combi with a 5-year manufacturer warranty. Suits flats and smaller homes, or anyone planning to move within a few years.
- Standard, from £2,295, our most popular: an ATAG combi with a 12-year warranty and a scale reducer fitted as standard. The right call for most homeowners staying put.
- Premium, from £2,795, best value per month: the same ATAG range with an 18-year warranty and a lifetime warranty on the heat exchanger — see our full ATAG comparison for why we specify it.
One bathroom and a kitchen tap running together is comfortably covered by any of the three. Two bathrooms used at similar times, or three or more, and we'll usually recommend stepping up to a higher-output model — tell us in the instant quote tool and we'll size it correctly rather than guessing from bedroom count.
What's included either way
- Removal and disposal of your old boiler
- All pipework and flue work needed for a compliant install
- A system clean, inhibitor and magnetic filter as standard
- Benchmark commissioning and warranty registration
- Building Control notification
None of that includes a deeper system clean. If your radiators are older or run cold at the bottom, see our guide on power flush vs MagnaCleanse vs a standard clean — skipping this on an older system is the single biggest cause of early boiler failures we get called out to.
Get a fixed price in a couple of minutes
Our instant boiler quote tool asks a handful of questions about your home and gives you a real fixed price on screen, no waiting for a callback. Get your instant boiler quote.
Keep reading
Landlord safety certificates explained
Gas safety records, EICRs and alarms: what the law requires, how often, and the deadlines that catch landlords out.
Read the guide
How to choose the right boiler
The differences between boiler types, how to pick the right one for your home, and what a proper installation includes.
Read the guideEICR codes explained
What each observation code on an EICR means, what makes a report unsatisfactory, and what to do about it.
Read the guide
Comparing boiler brands: why we fit ATAG
Why ATAG is our Standard and Premium boiler of choice, and how it compares to the brands you've actually heard of.
Read the guide
Power flush vs MagnaCleanse: do you need one?
What a power flush, a MagnaCleanse and a standard clean actually do, and which one your system needs before a new boiler goes in.
Read the guide
Magnetic filters vs scale reducers explained
Two small devices that quietly protect a new boiler for years — what each one does and why London's hard water makes both worth having.
Read the guide
Boiler Plus and programmable thermostats explained
The government rule behind why every new combi boiler comes with proper heating controls, explained in plain English.
Read the guide
Smart thermostats and OpenTherm explained
The difference between a basic thermostat and an OpenTherm smart thermostat, and whether the upgrade is worth paying for.
Read the guidePAT testing explained
What PAT testing actually checks, who's responsible for it, how often it's really needed, and roughly what it costs.
Read the guide