No hot water in The Stow? Boiler repairs sorted properly
No hot water but heating still works? On a combi, that's almost always a diverter valve, diaphragm or PCB issue. We carry the common parts, diagnose on-site and usually get it fixed in one visit across The Stow. Most The Stow repair callouts we diagnose and fix on the first visit — common parts (PRVs, diverters, pumps, PCBs) live on the van.
You're not getting a call centre — you're getting Grant.
The same engineer quotes the job, does the work, and answers the phone afterwards if anything's not right.
Gas Safe Registered
Every gas job legally signed off
18+ years on the tools
Grant has been fixing boilers in Harlow since before smart thermostats existed.
Real human on the phone
Most calls answered the same day, often within the hour.
Locally based in The Stow
Not a national chain — your local engineer, your local prices.
No hot water but heating still works? On a combi, that's almost always a diverter valve, diaphragm or PCB issue. We carry the common parts, diagnose on-site and usually get it fixed in one visit across The Stow. Most The Stow repair callouts we diagnose and fix on the first visit — common parts (PRVs, diverters, pumps, PCBs) live on the van.
About The Stow
Original new-town neighbourhood centre. Many original 1960s flats with undersized gas supplies that we've upgraded over the years.
Predominantly 1950s–70s post-war housing with a mix of terraces, semis, and 60s-built flats. Pockets of older stock around Old Harlow.
- Original 1960s flats often have undersized gas supply pipes that limit modern combi performance
- Older Old Harlow properties frequently have low mains water pressure that affects combi choice
- Many 60s/70s back boilers still in service — our regular work involves removing these and reinstating fireplaces
What's included
No Hot Water Repair
Diverter valves, diaphragms, PCBs — the common combi hot water faults.
Learn moreNo Heating Repair
Pump faults, airlocks, frozen condensates — getting heat back on quickly.
Learn moreLeaking Boiler Repair
Pressure valves, heat exchangers, pump seals — sealing leaks safely.
Learn moreBoiler Fault Code Diagnosis
F1, F22, EA, A01 — translating fault codes into real fixes.
Learn moreLocal, honest boiler repairs for The Stow homes
We've been doing boiler repairs in Harlow long enough to know which streets have shared chimneys, which estates have undersized gas supplies, and which boilers tend to fail first.
That experience means we get the spec right at the survey, not halfway through the install.
Diverter valve and PCB faults are particularly common across Harlow's older Worcester 24i and Vaillant ecoTEC units installed in the 2008–2014 boom.
Working with us on a boiler repairs job in The Stow
We pick up
Real person, not an answering service. We give you an honest arrival window.
We diagnose properly
Combustion analyser, multimeter, pressure gauges — proper diagnostic kit, not guesswork.
You get a price
Written, fixed, agreed before we proceed. Walk away free if you'd rather.
We fix it & guarantee the work
12-month guarantee on the repair. If the same fault comes back, we come back.
Quick answers on boiler repairs in The Stow
Why have I lost hot water but heating still works?▾
On a combi boiler this is the classic diverter valve symptom — the valve that switches the flame between heating and hot water has stuck. Common, and usually a one-visit fix.
How much will it cost?▾
Diverter valve replacement on most boilers is £180–£320 fitted. We'll give you a fixed price after diagnosis before any work starts.
How fast can you come out?▾
We aim for same-day on no-heat and no-hot-water situations. Tell us when you call if anyone elderly or with young children is in the property — we prioritise.
Do you charge a callout fee?▾
We charge a clear diagnostic fee (told to you upfront before we attend). It covers proper on-site diagnosis. The repair itself is then quoted as a fixed price you agree before any work starts.
What you get when you book us
- Real human on the phone, not an answering service
- Vulnerable household priority response
- Same-day response wherever possible
- Stocked van — most repairs done first visit
- All major brands — Worcester, Vaillant, Ideal, Baxi, Glow-worm
Other plumbing & heating work we do in The Stow
Boiler installs in The Stow
Worcester, Vaillant, Ideal and Glow-worm boilers fitted by Gas Safe registered engineers — sized properly, fitted neatly, and backed by manufacturer warranties of up to 12 years.
Boiler servicing in The Stow
Annual servicing keeps your boiler safe, efficient, and your manufacturer warranty valid. Full inspection, combustion analysis, and a written report.
Heating upgrades in The Stow
Cold radiators, noisy systems, sky-high bills? Power flushes, smart thermostats, radiator swaps and full system upgrades that pay for themselves.
Plumbing in The Stow
Everyday plumbing done properly — taps, toilets, leaks, washing machines, showers, outside taps and isolation valves.
At a glance
- Service
- Boiler Breakdowns & Repairs
- Coverage
- Harlow (CM17, CM18, CM19, CM20) and surrounding areas
- Response time
- Same-day where possible
- Credentials
- Gas Safe registered, fully insured, 12-month workmanship guarantee
- Pricing
- Fixed written quotes, no surprise extras
Roughly what you'll pay in The Stow
These are honest starting prices for jobs we do every week. Final quote depends on your property — we'll always confirm in writing before any work starts. No surprise add-ons.
| Job | Price |
|---|---|
Diagnostic call-out first hour on-site, transparent before any parts | from £85 |
Common parts (PCB, fan, pump) fitted same-visit where possible | £140–£380 |
No-heat / no-hot-water emergency same-day priority slot | from £120 |
Quote over the phone send a photo of the fault code | free |
Prices include VAT. Parts quoted separately and shown on your written quote.
Other ways The Stow customers find us for boiler repairs
Same engineer, same fixed pricing — different question, different answer.
Villages near The Stow we also cover
Hot water sorted in The Stow
Free written quote, no obligation. Real engineer, fixed price, fast response.