Hot water on demand
No waiting for a tank to heat. It also means no heat lost from a stored cylinder through the day.
Combi boilers · Croydon
Combi boiler installation in Croydon
Hot water on demand, no tanks, no waiting for a cylinder to heat up. We fit new combi boilers across Croydon, sized properly for your home and your water pressure.
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- Gas Safe No. 567789Check us on the register
- Fixed written quoteThe price you agree is the price
- Building Regs notifiedCertificate posted to you
- Warranty registeredWith the manufacturer, for you
How a combi works
One box does heating and hot water
A combination boiler heats water the moment you turn on a hot tap, straight from the cold mains. There is no hot water cylinder to store it and no cold water tanks in the loft, which is why combis are the most popular boiler in Croydon’s flats and terraced houses.
The trade-off is that a combi serves one outlet well at a time. Run a shower and a hot tap together and both slow down. For most one-bathroom homes that never matters. For a busy family with two bathrooms, a system boiler with a cylinder can be the better choice, and we'll say so.
Already have a combi? Then a like-for-like replacement is the simplest job we do: same position, same pipework, usually finished the same day. If you have a cylinder or loft tanks now and want to get rid of them, see combi conversions.
Good to know
Combi or not? The honest pros and cons
Frees up space
No cylinder, no loft tanks. Many people turn the old airing cupboard into storage.
Mains-pressure showers
With decent mains flow, showers are often stronger than a gravity-fed system without a pump.
One outlet at a time
Two showers at once is where a combi struggles. Bigger homes may suit a system boiler better.
Only as good as your mains
Low incoming flow means weak hot water whatever the boiler size. We measure it first.
No backup
With a cylinder you may have an immersion heater as a fallback. With a combi, no boiler means no hot water.
Sizing guide
What size boiler do I need?
A rough guide for Croydon homes. Bigger isn't better: an oversized boiler cycles on and off and wastes gas. We confirm the size by checking your water pressure and flow rate on the day of the survey.
| Home | Bathrooms | Usually suits | Output |
|---|---|---|---|
| Flat or 1 to 2 bed house | 1 bathroom | Combi | Around 24 to 28kW |
| 3 bed house | 1 bathroom | Combi | Around 28 to 32kW |
| 3 to 4 bed house | 1 bathroom + en-suite | Larger combi | Around 32 to 38kW, if mains flow allows |
| 4 bed or more | 2+ bathrooms used at once | System boiler + cylinder | Sized to the home’s heat loss |
How it works
How a combi installation works
- 1
Tell us about your boiler
Two minutes in the quote form: what you have, where it is, how big your home is. Add a photo of the boiler and the flue if you can.
- 2
Get a fixed price
A Gas Safe engineer reviews it and calls you with a written quote and a recommendation. If anything needs checking, we pop round first.
- 3
Installation day
We protect the floors, take the old boiler out, fit and commission the new one, clean the system and show you the controls.
- 4
Paperwork sorted
We register the warranty with the manufacturer and notify Building Control through the Gas Safe Register. Your certificate arrives by post.
FAQ
Combi boiler questions
Is a combi boiler right for my home?
Combis suit most flats and houses with one bathroom, and many with a bathroom and en-suite. They struggle where two showers often run at once, or where the mains water pressure or flow is poor. We check both before recommending one.
How do I know if I already have a combi?
If there is no hot water cylinder anywhere in the house, usually in an airing cupboard, and you get hot water as soon as you turn a tap on with the heating off, you almost certainly have a combi.
Can a combi be moved to a different room?
Yes. Kitchens, utility rooms, bedrooms and lofts are all common. Moving it means new gas, water and condensate pipe runs and a new flue position, so it usually adds a day. Pick “A different room” in the quote form and we’ll price it.
Why is my hot water flow weaker with a combi?
A combi can only deliver as much hot water as the cold mains coming into the house. If the flow rate into the property is low, a bigger combi won’t fix it. That’s why we measure it rather than guess.
What kW combi do I need?
It depends on your hot water demand more than your radiators. As a rough guide, flats and smaller homes suit around 24 to 28kW, and three bedroom homes around 28 to 32kW. We confirm the size on the survey.
More boiler help
- Boiler installationNew boilers fitted across Croydon
- Boiler replacementSwap an old or broken boiler
- ConversionsSystem, regular or back boiler to combi
- Boiler repairBreakdowns, leaks, fault codes
- Boiler servicingAnnual service and landlord certificates
- Installation costWhat decides the price
- Emergency repairNo heating or hot water today
- Landlord certificatesAnnual gas safety record (CP12)
- Power flushClear sludge, fix cold radiators
- Moving a boilerNew room, new wall or the loft
Get a fixed price for a new combi
Answer a few quick questions, add a photo if you can, and a Gas Safe engineer will come back to you with a price.