Hot Water Cylinder Cost: Typical UK Market Ranges
LCS prices are fixed: diagnosis £180, annual service £180, replacement labour £1,450 and new installation £2,400, and no VAT is charged. The cylinder is priced separately. The guides below use named public sources instead, kept apart so you can compare quotes properly.
London Cylinder Specialist, londoncylinderspecialist.co.uk/cylinder-costs
What are the LCS prices?
Each LCS price is fixed, and no VAT is charged. There is no call-out fee. The list says what each one covers.
- Cylinder troubleshooting and diagnosis: £180
- Annual cylinder service: £180
- Cylinder replacement, labour and miscellaneous parts: £1,450, with the cylinder priced separately
- New cylinder installation, including pipework, installation, commissioning and Building Regulations: £2,400, with the cylinder priced separately
Cylinder price depends on type, size and your preference; we recommend the right one. We cover London inside the M25, 24/7.
What are the typical UK market ranges?
Each figure below is a typical UK market range from one named public guide, repeated from the cost article it belongs to. None is an LCS price, and the guides disagree with each other. They include the cylinder, which LCS prices separately.
- Vented cylinder replacement, fitted: typical UK market range of £750 to £1,400 (BestBuilders, August 2026)
- Unvented cylinder replacement, fitted: typical UK market range of £900 to £3,000 (BestBuilders), or £1,800 to £3,500 for a standard unvented job (BookaBuilderUK, undated)
- Vented to unvented conversion: typical UK market range of £1,300 to £3,000 (BestBuilders)
- Annual unvented cylinder service: typical UK market range of £80 to £150 (BestBuilders)
- Immersion element replacement, fitted: typical UK market range of £150 to £300 for the element, £200 to £400 with a thermostat (BestBuilders)
- Unvented safety kit, supplied: typical UK market range of £180 to £320, and an external expansion vessel part £80 to £180 (Squote)
No public UK guide found prices a relief valve or an expansion vessel job on its own, and the evidence behind several of these ranges is thin. Each article says how strong its own sources are.
What moves a cylinder quote?
Cylinder type and size set the unit cost. Access decides how long it takes to get an old cylinder out and a new one in. The valve group, tundish and expansion vessel come with an unvented job. Making good after a leak, such as damp or a rotted base, is a separate item that quotes often leave out. Ask for the items to be listed, as in the cylinder replacement hub.
Which cost guides are on this site?
They are hot water cylinder replacement cost, unvented cylinder installation cost, unvented cylinder service cost, immersion element replacement cost and TPRV and expansion vessel replacement cost. What a repair involves depends on the fault, which a hot water cylinder diagnosis finds.
Guides on this topic
Questions people ask
How much does a new hot water cylinder cost?
The cylinder and the labour are priced separately. Replacement labour is a fixed £1,450, and no VAT is charged. The cylinder depends on type, size and your preference, and we recommend the right one. Figures from public guides, with named sources, are in the cost guides linked from this hub.
What does a cylinder diagnosis cost?
Cylinder troubleshooting and diagnosis is a fixed price of £180, and no VAT is charged. There is no call-out fee. It shows whether the job is a setting, a part or a replacement.
Are the ranges on this site what LCS charges?
No. They are typical UK market ranges from published sources. The LCS prices are the fixed prices at the top of this hub.