24/7 EMERGENCY
Burst pipe? Boiler down? No hot water? Engineers on call right now —
24/7 EMERGENCY
Burst pipe? Boiler down? No hot water? Engineers on call right now —
We replace and install hot water cylinders across Westminster — vented cylinders for traditional loft-tank systems in period townhouses, and unvented cylinders for mains-pressure performance in mansion flats and new-build apartments. Fixed price, clean installation, 12-month workmanship guarantee.
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NW8
The right system depends on your floor build-up, the room, and whether you’re retrofitting or extending. Here’s how the two options compare.
Fed from a cold water tank in the loft, common in Marylebone and St John's Wood townhouses with the traditional gravity-fed layout still in place. Lower pressure at showers and taps, but simpler and typically less expensive to replace like-for-like. Straightforward swap in most period properties still on this system, usually completed in a day.
Fed directly from the mains at full pressure, no loft tank required — the standard choice in Belgravia and Mayfair basement conversions and Pimlico's newer mansion flats. Strong, even mains pressure throughout the property — the usual upgrade when replacing an old vented cylinder as part of a bathroom renovation. Must be installed and commissioned to Building Regulations Part G3 by a competent person — we handle notification and certification as part of every install.
Cylinders typically last 10 to 15 years — here’s what to look out for as they near the end of their life.
Running out of hot water faster than it used to, or noticeably weaker pressure, often points to internal corrosion or scale buildup reducing the cylinder's effective capacity — common in older vented cylinders in Marylebone's period townhouses.
Rust staining, damp around the base, or a visible leak from the cylinder body means it's failing and should be replaced before it causes water damage — a particular concern in basement plant rooms below street level in Belgravia.
Brown or rusty-coloured hot water, or a metallic smell, usually indicates internal corrosion inside an ageing cylinder.
Even without obvious symptoms, cylinders approaching or past this age are at higher risk of failure — worth checking during a routine service, especially in Pimlico's older mansion block conversions.
From assessment through to a fully commissioned, tested cylinder — with all necessary certification handled for you.
We check your existing cylinder, system type and hot water demand to recommend vented or unvented, matched to the right capacity, and confirm a fixed price before work begins.
The system is safely drained and the old cylinder disconnected and removed, with care taken in tight plant rooms and basement spaces.
The new cylinder is fitted, plumbed in, and connected to safety valves and controls to current regulations, including G3 compliance for unvented systems.
The system is refilled, pressure-tested and checked for correct operation before we finish, with certification issued and your 12-month guarantee confirmed in writing.
A correctly sized cylinder matched to your household's demand, so you're not running short at peak times.
Strong, consistent mains pressure at every tap and shower when upgrading from an old vented system.
Every unvented install is completed and certified to Building Regulations Part G3, with documentation provided.
Every installation is covered in writing, with a fully trained and fully insured team standing behind the work.
Cost depends on cylinder type, capacity and complexity of the existing system. All prices confirmed before work begins — no call-out charge.
Standard loft-tank fed system, up to 200L
New unvented cylinder, G3 compliant, up to 210L
Full upgrade including new pipework and safety valves
Leak, pressure or temperature issue investigation
Full system check, safety valve test, inspection
All prices are indicative — your fixed quote follows a free, no-obligation assessment at your Westminster property.
Fast arrival for call-outs across W1, WC1, WC2, SW1, NW1 and NW8 without cross-city dispatch delays.
Every unvented cylinder is installed and certified to Building Regulations Part G3, with documentation provided as standard.
Comfortable working in the tight, below-street-level plant rooms common in Belgravia and Mayfair's larger period properties.
The same fixed pricing applies whether you're in SW1 Belgravia or NW8 St John's Wood. No zone uplift, no call-out charge.
Over 270 cylinder replacements and heating jobs completed across the borough — 4.9★ from local customers.
All cylinder replacement work in Westminster carries our 12-month workmanship guarantee, issued in writing before we leave.
Read all reviews on Trustpilot →
“Our Marylebone townhouse had the original vented cylinder, well past its best, with rusty water most mornings. Replaced like-for-like in a day, hot water’s been clean and consistent since.”
“Converted our old tank-fed system to unvented as part of a bathroom renovation in Belgravia. The difference in pressure is remarkable, and they handled all the building regs paperwork without us having to chase anything.”
“Cylinder in our Pimlico mansion flat’s airing cupboard started leaking overnight. They diagnosed it same day, had a new unvented unit fitted and certified within 24 hours, and the plant room was left spotless.”
A like-for-like vented cylinder replacement starts from £680. A new unvented cylinder installation starts from £1,450. A full vented-to-unvented conversion starts from £1,850. All prices confirmed before work begins.
If you're tired of weak pressure from a loft-tank fed system, an unvented cylinder gives strong mains pressure throughout the property. It's the standard choice we fit in Belgravia and Mayfair basement conversions and Pimlico's newer flats.
No planning permission is needed, but the installation must comply with Building Regulations Part G3 and be carried out by a competent person — we handle this, including certification, as part of every unvented install.
A like-for-like vented replacement typically takes half a day to a full day. A full vented-to-unvented conversion, including new pipework and safety valves, usually takes 1 to 2 days.
Yes. We regularly replace cylinders in the tight, below-street-level plant rooms common in Belgravia and Mayfair's larger period properties.
No. There is no call-out charge, no Central London zone surcharge, and no area uplift for any postcode within Westminster.
Fixed price confirmed before we start. Wet and electric systems fitted or repaired. 12-month guarantee. Same-day across W1, WC1, WC2, SW1, NW1 and NW8.
We also cover these neighbouring boroughs — same fixed prices, same-day availability.
