If you’re searching “combi boiler” you probably don’t want a sales pitch. You want to know: will it actually work in your house, will it keep up with demand, and is it going to be a money pit in two winters.
I’m Stuart at SKR Plumbing & Heating. I’m based around Orpington (BR6) and I’m in and out of Bromley, Petts Wood, Chislehurst, Locksbottom, Bickley, Hayes, West Wickham and the wider BR/SE/CR areas most weeks. I fit combis, fix combis, service combis… and I also tell people when a combi is a bad idea.
If you’re stuck near Nugent Shopping Park or crawling along the A21 with no heating at home — ring me. Even if it’s just to sanity-check what you’re being told.
I’ll say this upfront: if your home has two showers running most mornings, or the incoming mains pressure is weak, a combi can make you miserable. Not always — but often enough that it’s worth being honest about it.
I’ve been to installs where a combi has been shoved in because it was “cheapest”, and the homeowner ends up with a lukewarm shower and a kitchen tap that goes cold when someone flushes upstairs. Then I’m the one trying to explain the physics of flow rates in a hallway while everyone looks at me like I’ve brought bad news.
The point of this page is to help you decide sensibly — and if you’re in Orpington, Bromley or nearby, to show you what a proper combi installation looks like (not a rushed swap).
Real-world goal: hot water that’s stable, heating that’s responsive, and a system that’s safe and serviceable.
My approach: engineer-first, sales-second. If your boiler is fine, I’ll tell you that too.
If you answer “yes” to most of these, you’re usually in good territory:
• One bathroom (or you don’t regularly run two showers at once)
• Decent mains pressure (your cold tap doesn’t feel pathetic)
• You want to lose the old cylinder / free up cupboard space
• Your home is a flat, maisonette, or a standard 2–3 bed house
Tiny thing people forget: a combi relies on the cold mains. If the incoming supply is weak, the boiler can be brilliant and you’ll still be disappointed.
We can check pressure and flow properly during a survey — not guess.A combi boiler heats water “on demand”. There’s no hot water cylinder storing it for later. When you open a hot tap, the boiler switches over and pushes heat through a plate heat exchanger to warm the water as it flows. When you turn the tap off, it stops.
That’s why combis can be brilliant: fewer parts, less space, quick response. It’s also why they’re not magic. The boiler can only heat a certain amount of water per minute — so the flow rate matters. If you’ve got a big family, two bathrooms, and everyone lives in the shower… I’m going to talk you through options instead of smiling and nodding.
If you’re already dealing with faults (pressure drops, odd noises, heating cutting out), you might be better starting with a diagnosis first — have a look at how we approach boiler fault-finding without guesswork.
SKR started the way a lot of decent trades businesses start: one person, one van, and a standard that’s a bit stubborn. I’ve always preferred doing fewer jobs properly rather than flying through a day and leaving problems behind.
We’re Gas Safe registered, qualified, and we work across domestic heating and plumbing — boilers, radiators, controls, bathrooms. It means I’m not just swapping a box on a wall. I’m looking at the whole system: water quality, pipework sizing, ventilation, and whether the setup is even sensible for the way you live.
The local bit matters too. I’m regularly around Orpington High Street, the back roads off Crofton Road, the A232 into Bromley, and I’ve spent enough time in BR postcodes to know which houses hide the stopcock behind the washing machine (and which ones make you crawl under stairs like a contortionist).
A well-specified combi isn’t “fancy”. It’s just calm. Hot water stays stable. Radiators heat evenly. The boiler doesn’t short-cycle itself to death. You stop thinking about it — which is the whole point.
Safety: flue integrity, combustion checks, correct ventilation where needed.
Efficiency: correct flow temperatures, proper controls, not just “turn it up and hope”.
Serviceability: access for future servicing and repairs (yes, I care about the next engineer too).
If your boiler is staying but you want it running right, this page explains what we do in an annual visit: our full boiler servicing process (done properly).
This is the bit most websites skip because it doesn’t “convert”. But it does prevent regret.
If you’ve got two bathrooms and people are genuinely using them at the same time, a combi can struggle — not because it’s broken, but because it’s being asked to do something it wasn’t built for. Same story with low incoming mains pressure, or older properties where the supply is inconsistent at peak times.
I did a visit not far from Farnborough Village where the homeowner had been quoted a combi swap. Lovely house, two showers, teenagers… you can see where this goes. The existing setup had a cylinder and it was actually doing the job — it just needed attention to controls and water quality.
We didn’t “sell a boiler”. We sorted the underlying issues, and they kept a system that suited the house. That’s the kind of decision I’m happy to put my name on.
If you’re specifically considering a replacement, this is the practical next step: see how a boiler installation is planned, priced and carried out.
A combi boiler job might be a straight replacement, or it might involve correcting things that have been “just about working” for years — undersized gas pipework, messy condensate routes, poor controls, sludge in the system, you name it.
Combi boiler replacements (like-for-like or upgraded output)
Conversions where it makes sense (and only where it makes sense)
System clean / water quality checks and remedial work
Controls upgrades for better comfort and lower running costs
Commissioning & paperwork done properly (Benchmark, notifications, etc.)
If you’re browsing brands already, you might like these manufacturer-focused pages we’ve built from real jobs: Worcester boiler servicing and common faults, Vaillant diagnostics and servicing notes, Baxi boiler repair patterns we see locally, and Ideal boiler servicing and fault clues.
This is the part that decides whether your boiler lasts.
• Gas rate checks and combustion analysis (calibrated kit)
• Flue installation inspected internally and externally
• System pressure set correctly and tested under load
• Controls set up so the boiler runs efficiently (not just “on/off”)
• Clear handover — what to do, what not to do, and why
If you’ve ever been handed a boiler manual and a “cheers mate” — yeah, we don’t do that.
You should understand your own heating system when we leave.If you tell me your postcode, boiler make/model, and how many bathrooms you’ve got, I can usually give you a straight answer on whether a combi makes sense — and what size/spec you actually need.
Call 07706 889 614 or send your details through our contact page. If you’re on the road and it’s one of those days (A21 crawling, rain sideways), a quick phone chat is often easiest.
“Came out on a Sunday… kept me informed of ETA and cost.” That one stuck with me because it’s the boring stuff that matters when your heating is down — communication, timing, and no surprises.
★★★★★ Paraphrased from a verified review • Job location: CR2“Very efficient and knowledgeable.” A radiator move sounds simple until you hit old pipework and a wall that isn’t where it’s supposed to be. We got it done cleanly.
★★★★★ Paraphrased from a recent review • Job location: CR0“Multiple jobs… boiler service, radiators, gas oven install — all tidy and hassle-free.” That’s basically the aim. Do the work, respect the house, leave it better than we found it.
★★★★★ Paraphrased from a verified review • Job location: DA4“Leak found and fixed before it got worse.” Not every call-out is dramatic, but catching things early saves people a lot of grief (and cost).
★★★★★ Paraphrased from a recent review • Job location: BR6These are here because homeowners end up asking the same questions on calls. If you’ve got five minutes, they’ll save you guessing.
What we check, what’s included, and what corners we don’t cut.
Combustion analysis, safety controls, and the stuff that prevents winter breakdowns.
Sometimes a “new boiler needed” is just a diagnosis that never happened.
If it’s sized properly, commissioned properly, and serviced yearly, you can often see 10–15 years. If it’s been hammered at high temperatures, never serviced, and the system water is awful… you’ll know about it much sooner. Longevity is less “brand magic” and more about setup and maintenance.
Sometimes, yes — but it depends on water demand and incoming mains flow. Two showers at once is where people feel it. If you tell me what you’ve got (and how the house is used day-to-day), I’ll be straight about whether you’ll love it or hate it.
Not automatically. Bigger output can help hot water flow, but oversizing for heating can cause short-cycling (lots of on/off), which isn’t great for efficiency or wear. The “right” size is a balance of heating load and hot water needs.
Yes. A combi can seem fine right up until it isn’t — and warranties usually require annual servicing anyway. A proper service is also a safety check. It’s not just “cleaning”.
Rushed swaps with no attention to the system. Dirty water, poor controls, and pipework issues get ignored because the new boiler “fires up” and everyone moves on. Then the homeowner rings months later with noisy radiators or a boiler that’s cycling like mad. Fixing the foundation matters.
If you’re in Orpington, Bromley, Chislehurst, Petts Wood, Locksbottom (or nearby BR/SE/CR postcodes), I can talk you through the best route and what it would look like in your home.
Short version: call 07706 889 614.
Longer version: if you’d rather send details and a photo of the boiler display, you can
message us here and I’ll reply between jobs.
No pressure, no awkward upsell. If a repair or service is the smarter move, I’ll say so.
