24/7 EMERGENCY

Burst pipe? Boiler down? No hot water? Engineers on call right now —

Mon–Fri 8am–6pm · Sat 9am–5pm ·

Emergency line open 24/7

Gas Safe Reg: 123456

Trustpilot 4.9★

BOOK ANY TIME — ALL OF LONDON

24/7 Hot Water Cylinder Replacement in London

Our booking line never closes. Call or request online 24 hours a day, and we’ll get a Gas Safe registered engineer out to replace your hot water cylinder — including evenings and weekends — at a fixed price agreed before we start.

BOOK YOUR REPLACEMENT — ANY TIME

Respond within 2 hours · No call-out charge
🔒 Your details are never shared. We call back within 15 minutes, day or night.

24/7

Booking line, 365 days a year

4.9★

Trustpilot, 1,800+ reviews

Same-Day

Fitting available across London

33

London boroughs covered

£0

Call-out charge, ever

Gas Safe Reg. 123456

Which? Trusted Trader

TrustMark Registered

★ Trustpilot 4.9

£5M Insured

Worcester Bosch Accredited

SIGNS YOU NEED A REPLACEMENT

Is Your Hot Water Cylinder on Its Way Out?

Most cylinders last 10–15 years. These are the warning signs our engineers see most often, right across London.

Leaking or Rusty Water

Water pooling around the base, or discoloured water from the hot tap, usually means internal corrosion.

Inconsistent Hot Water

Running out of hot water quickly, or water that's never quite hot enough, points to a failing cylinder or element.

Banging or Rumbling Noises

Limescale build-up inside older cylinders can cause knocking sounds as the water heats.

Weak Water Pressure

Refixing or replacing brackets and lengths that have come away from the fascia.

CAPABILITY

Vented or Unvented — We Fit Both

The right cylinder depends on your existing system, your mains pressure, and what you want to improve.

Vented Cylinder Replacement

A straightforward like-for-like swap fed from a cold water storage tank in the loft — usually the simplest and most cost-effective option if your existing system works well.

Simplest, most cost-effective

Unvented Cylinder Replacement or Upgrade

Fed directly from the mains, giving strong, consistent pressure at every outlet without a loft tank. Requires Building Regulations G3 compliant installation, which we handle as standard.

Best water pressure

TRANSPARENT PRICING

Hot Water Cylinder Replacement Cost in London

Fixed prices agreed before we start — the same price whether you book at midday or 2am, and the same price in every borough.

Fixed Price

Vented Cylinder Replacement

Half day · like-for-like swap

from £950

Most Common

Fixed Price

Unvented Cylinder Replacement

1 day · G3 compliant install

from £1,650

After Survey

Larger / High-Capacity Cylinder

1 day · larger households

from £2,400

💡 All prices are fixed and agreed before work starts, including disposal of your old cylinder and full pressure testing. No evening, weekend or bank holiday surcharge, and no zonal uplift wherever you are in London.

THE PROCESS

How Booking Works, Any Hour of the Day

From your call to hot water restored — in four clear steps, whatever time you get in touch.

Call or book online

Tell us about your cylinder and the best time for you — including evenings and weekends. Takes under 2 minutes.

Slot confirmed fast

We call you back within 15 minutes to confirm an appointment time that suits you, day or night.

Fixed price agreed on arrival

Your engineer assesses your existing system and confirms the price before starting. No surprises on the invoice.

Fitted, tested, guaranteed

Cylinder fitted, tested, and Building Regs certified where required. Written report and 12-month guarantee emailed the same day.

WHY CHOOSE US

What Makes Our 24/7 Booking Different

Genuinely available around the clock

No answering machine at night — a real person picks up and books your appointment, any hour.

Evenings and weekends, no surcharge

The price you're quoted for a Sunday evening slot is the same as a Tuesday morning one.

Both vented and unvented systems fitted

Honest advice on which cylinder suits your home, not just the most expensive option.

Fixed price — no zonal surcharge

Same pricing whether you're in Zone 1 or Zone 6, in any of the 33 London boroughs.

Gas Safe registered

Reg. No. 123456 — for any wider heating work needed alongside your replacement.

12-month guarantee on every job

All installations across London carry our written workmanship guarantee, whatever time they were booked.

Verified Customer Reviews

Hot water cylinder customers across London

4.9

Trustpilot

4.9★

Google

4.8★

Which? Trusted Trader

Read all reviews on Trustpilot →

“Called at 10pm when we noticed our cylinder was leaking and had a slot booked for the next morning. Clear pricing from the start, no surprises.”

Picture of  David P

David P

North London

✓ Verified

“Upgraded from vented to unvented for better pressure. Booked an evening survey since we’re both out during the day — no extra charge for it.”

Picture of  Sandra O.

Sandra O.

South London

✓ Verified

“Old cylinder kept making banging noises for months. Rang on a Saturday and had it replaced with a new unvented one by the afternoon.”

Picture of Thomas N

Thomas N

East London

✓ Verified

FAQs

24/7 Hot Water Cylinder Replacement in London — Questions Answered

Yes. Our line is answered by a real person 24 hours a day, 7 days a week, 365 days a year, so you can book or ask questions whenever suits you — including nights, weekends and bank holidays.
 
Yes. We offer evening and weekend appointments at no extra cost — the fixed price you're quoted is the same whatever time of day or week your replacement takes place.
 
It can be urgent if your cylinder is actively leaking, but most replacements are planned rather than emergency callouts. What's genuinely 24/7 is our booking line, so you can arrange an appointment whenever you get in touch, day or night.
 
A vented cylinder is fed from a cold water tank in the loft, while an unvented cylinder is fed directly from the mains, giving stronger and more consistent pressure at every outlet. Unvented systems require Building Regulations G3 compliant installation, which we carry out as standard.
 
A vented cylinder replacement starts from £950, an unvented replacement or upgrade from £1,650, and a larger high-capacity cylinder from £2,400. All prices are fixed and agreed before work starts.
 
Yes. We replace hot water cylinders across all 33 London boroughs, from Zone 1 through to the outer suburbs, at the same fixed prices with no zonal uplift.

Ready to Replace Your Hot Water Cylinder?

Call our 24/7 line or book online. Fixed price agreed before we start, evenings and weekends available at no extra cost, anywhere in London.