London, United Kingdom – October 19, 2026 – London Leak Specialist Ltd, a London leak detection company, has launched London Cylinder Specialist as its cylinder division, a team of five cylinder experts, each required to have at least 10 years of experience working on cylinders, that diagnoses, repairs, services and replaces hot water cylinders, including unvented cylinders, across London inside the M25, 24 hours a day. The team starts with a diagnosis and publishes its prices: a £180 fixed price for the diagnosis, with no call-out fee, and fixed prices for replacement and new installation, with no VAT charged. The launch comes with more than 50 pages of fault-finding guides, cost guides and an interactive cylinder explorer.
Key facts
What it is: the hot water cylinder division of London Leak Specialist Ltd, working as London Cylinder Specialist. The parent company’s website showed strong organic traffic from Google, appearing in about 105,000 search results in the three months to 17 October 2026 (Google Search Console). The company also reported in September 2026 a 95% find rate across its last 400 leak detection surveys. It publishes high-quality articles that guide customers on how to diagnose and maintain hot water cylinders correctly, helping them avoid unnecessary call-outs and spending.
How much does a hot water cylinder replacement cost in London?
London Cylinder Specialist publishes the labour side of the job as a fixed price on its pricing page. Replacing a cylinder costs £1,450 for labour and miscellaneous parts, and a new installation, with pipework, commissioning and Building Regulations, costs £2,400, with no VAT on either. The cylinder is priced separately, because its price depends on type, size and preference, and the team recommends the right one. For context, the cost guide BookaBuilderUK puts installation labour for a standard unvented cylinder at £600 to £1,500 in 2026; that is a national range, and a fixed price removes the range.
Is no hot water always a failed cylinder?
No. The company’s own job records show that a no-hot-water call can be a controls problem rather than a failed part. Of 14 recorded cylinder jobs, three began as no hot water or an unreliable supply and ended with a cause outside the cylinder: a programmer set for too few heating hours, a melted fuse left over from an earlier visit, and an intermittent fault that was not present on inspection. That is why the team starts with a diagnosis before recommending any replacement.
What goes wrong inside an unvented cylinder?
The recurring fault in the same records is the temperature and pressure relief valve or the combination valve discharging through the tundish, the visible fitting that shows a safety device is releasing water. In two jobs, water from a valve discharge reached the base of the cylinder or the wall beside it and left mould that had to be dealt with before parts were replaced. Limescale on the tundish and the stopcock, and an expansion vessel that needed re-pressurising or replacing during a service or a cylinder swap, were also recorded. A guide to a TPRV dripping on an unvented cylinder lists what to check before calling.
What happens on replacement day, and what does a service check?
In a recorded 50-litre cylinder swap, the supplies were isolated, the cylinder drained and removed, and a combination valve, expansion vessel and both tundish assemblies fitted, then the system was refilled, purged and the thermostat set, with the tenants told to allow one to two hours to heat. A recorded annual service re-pressurised the expansion vessel and inspected the valves, stopcock and tundish for wear, corrosion and limescale.
What do the Building Regulations require for an unvented cylinder?
Approved Document G, which sets out the Building Regulations guidance for hot water systems in England, requires a hot water system with a storage vessel to prevent the stored water exceeding 100°C and to convey any discharge from its safety devices safely to a place where it is visible, which is the job of the tundish. It also says that installing an unvented system is notifiable building work that must be notified to building control before work begins, unless the installer is registered with a competent person scheme, in which case the installer self-certifies the work and the building owner receives a Building Regulations certificate. London Cylinder Specialist self-certifies its installations through a competent person scheme.
What temperature should a hot water cylinder store water at?
The Health and Safety Executive says that, to control legionella risk, a hot water cylinder should be set so that water is stored at 60°C, and that tenants should be told not to adjust the cylinder’s temperature setting. A 2024 government study notes that hot water has historically accounted for about 18% of domestic energy consumption.
“A cylinder that is not heating is often not the cylinder,” said Adrian N., director of London Leak Specialist. “The honest first step is a fixed-price diagnosis, with no call-out fee, so the customer knows what is wrong before anyone talks about replacing it.”
How do customers find the company?
London Leak Specialist says that around 20 calls a day across its London phone lines now come from callers who tell it they used ChatGPT or Gemini, which is why its guides, and those of London Cylinder Specialist, are written as direct answers with named sources and published prices.
Availability
London Cylinder Specialist covers London inside the M25, 24 hours a day, for homeowners, landlords and letting agents. Customers can book through the London Cylinder Specialist website or by calling 020 7870 1666. The team’s parent company, London Leak Specialist, describes the arrangement on its own website.
About London Cylinder Specialist and London Leak Specialist
London Cylinder Specialist is a trading name of London Leak Specialist Ltd, a London company registered in England and Wales with company number 17437507 and a registered address at 71-75 Shelton Street, Covent Garden, London WC2H 9JQ. It launched its website in October 2026 with a team of five cylinder experts, each of whom the company required to have at least 10 years of experience in cylinders, and publishes its prices. The team diagnoses, repairs, services and replaces vented and unvented hot water cylinders. Its mission is to find the fault first, and to say plainly what a repair or replacement costs.
Media contact: London Cylinder Specialist, 020 7870 1666, info@londoncylinderspecialist.co.uk, https://londoncylinderspecialist.co.uk/
Media ContactCompany Name: London Leak Specialist LtdContact Person: Adrian NeaguEmail: Send EmailPhone: 020 7123 8560Address:71-75 Shelton Street Covent GardenCity: LondonState: WC2H 9JQCountry: United KingdomWebsite: https://londonleakspecialist.co.uk/
