Combi boilers · South Croydon CR2
Combi boiler installation in South Croydon
South Croydon has three quite different kinds of combi job: a flat in a converted Victorian house, a whole Victorian or Edwardian house with solid walls, and a larger family home out towards Sanderstead. Each needs a different conversation before the boiler goes on the wall.
- About 2 minutes
- No obligation
- Used only for your quote
- Gas Safe No. 567789Check us on the register
- Fixed written quoteThe price you agree is the price
- City & Guilds certifiedTrained and qualified
- Fully insuredPublic liability cover
South Croydon homes
Your home, your combi job
Find the row that sounds like yours.
| Home | Usual combi set-up | What we look at first |
|---|---|---|
| Flat in a converted house near South End | A compact combi in a kitchen cupboard or hallway | The flue route, and whether the freeholder needs to agree |
| Victorian or Edwardian house | Often a regular boiler with loft tanks now, converting to a combi | Heat loss through solid walls and high ceilings, and mains flow |
| Family home towards Sanderstead | A larger combi, if one bathroom is in use at a time | Whether an en-suite tips it towards a system boiler |
Every recommendation is confirmed on the survey.
Converted flats
Flats where the flue can’t just go anywhere
Converted houses near South End often have one combi per flat, squeezed into a kitchen cupboard or hallway. Flue routes can be tricky: the boiler may be in the middle of the building, or the nearest outside wall may be close to another flat’s window. Flue position is regulated near windows, doors, boundaries and eaves, so the route decides what we can fit and where.
Photos of the outside wall where the flue leaves the building help us price without a visit. If the flue would need to change position, your freeholder may need to agree first. We’ll give you the details to send them. More on this kind of job on our boiler replacement in flats page.
Victorian and Edwardian houses
Solid walls and high ceilings change the sizing
Older South Croydon houses lose more heat than a modern house of the same size, because of solid walls and tall rooms. That matters for a combi in 2 ways. The heating side has to keep up on the coldest days, and the hot water side has to suit how many people use the bathroom.
Many of these houses still have a regular boiler with tanks in the loft. Going to a combi takes the tanks and cylinder out, and gives mains-pressure showers if the incoming flow is strong enough. We measure it before recommending one. See combi conversions for what that job involves, or the South Croydon area page for repairs and servicing.
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 |
Before you choose anyone
Six questions to ask any boiler installer
Including us. A good installer will be glad you asked.
- 01
“Can I see your Gas Safe ID card?”
Check the card is current and covers gas boilers. It’s on the back.
- 02
“How have you sized the boiler?”
A good answer mentions your bathrooms, hot water use and water flow, not just bedrooms.
- 03
“Is the price fixed, and what isn’t included?”
You want a written price that lists the work, not an estimate that grows on the day.
- 04
“Will you clean the system first?”
Fitting a new boiler to dirty water shortens its life and can affect the warranty.
- 05
“Who registers the warranty and notifies Building Control?”
Both should be done for you, in your name.
- 06
“What happens if something goes wrong after you leave?”
Know who to call, and how the warranty works with the installer.
In South Croydon
Combi boiler installation nearby
FAQ
Combi questions from South Croydon
Can you replace a combi in a converted flat?
Yes. We check the flue position meets the rules and whether the freeholder needs to agree to any change, then fit a combi sized for the flat.
My Victorian house is always cold. Will a bigger combi fix it?
Not on its own. If the radiators are too small for the rooms, a bigger boiler can’t push more heat into them. We size the boiler to the heat loss and tell you if any radiators need upgrading.
I have a bathroom and an en-suite. Combi or system?
If the 2 showers are rarely used at once and your mains flow is good, a larger combi can work. If they often run together, a system boiler with a cylinder will serve you better. We’ll explain the trade-off.
Do you cover all of CR2?
Yes, including South Croydon, Sanderstead, Selsdon and Croham.
Guides
Read before you decide
- Choosing a boilerCombi boilers: water pressure and flow rate explainedWhy your mains water flow rate matters for a combi boiler, the difference between pressure and flow, a simple home test, and what to do if it’s low.Read the guide
- Choosing a boilerWhat size boiler do I need?What size boiler do you need? How kW, mains flow rate, bathrooms and heat loss decide it, why bigger isn’t better, and the rough sizes for flats and houses.Read the guide
- Rules and paperworkBuilding Regulations certificate for a new boilerWhy a new boiler needs a Building Regulations Compliance Certificate, how notification through the Gas Safe Register works, and what to do if you never got one.Read the guide
Everything we do
New boilers
Conversions
Repairs & servicing
Get a combi price in South Croydon
House or flat, the form takes about two minutes. Photos of the boiler and the flue help most.