Hot Water Cylinder Repair & Replacement in Bristol

Vetted & insured engineers Clear pricing before work starts G3-qualified for unvented cylinders No gas work — plumbing only

Immersion heater tripping the electrics? Cylinder taking twice as long to heat? These are specific, diagnosable faults with known causes, and our Bristol engineers carry the common parts: elements, thermostats, immersion heaters and valve kits.

Bristol water notes: Bristol's water is hard — much of it from Mendip limestone sources — so scale is a constant background factor in element failures, weak showers and tired tap cartridges across the city. Bristol pairs Georgian and Victorian stock in Clifton, Montpelier and Totterdown — often on steep gradients with long internal pipe runs — with dense modern harbourside apartments, keeping the plumbing mix broad. Mains supply here is managed by Bristol Water.

Vented vs unvented: what you've got matters

Identify yours in seconds: a cold-water tank in the loft and a vent pipe curving over it means vented; a white or stainless pressurised unit with an expansion vessel, pressure-reducing valve and a discharge tundish means unvented. The distinction matters because unvented systems store hot water at mains pressure and are Building Regulations G3-controlled — repair and installation are restricted to qualified engineers, which is exactly who your Bristol job is routed to.

Common cylinder faults we repair

Failed immersion heater elements (scale-shortened life is routine in harder water), faulty cylinder thermostats causing overheat or lukewarm water, motorised valve failures leaving heating without hot water or vice versa, expansion vessel recharge or replacement on unvented systems, passing temperature/pressure relief valves discharging through the tundish, and perished coil connections. Most are same-visit repairs with carried parts in Bristol.

Repair or replace: the honest arithmetic

A cylinder under ten years old with a component fault is nearly always worth repairing. Past fifteen years, with heavy scale, repeated element failures or corrosion at the connections, replacement wins on running cost alone — a scaled coil transfers heat badly, so you pay to heat water slowly. Replacement quotes in Bristol itemise the cylinder, the safety kit (for unvented), and disposal, so you can compare like with like.

Cylinder costs in Bristol

From £135 covers most Bristol cylinder repairs with common parts. Replacement is a bigger conversation — vented like-for-like at the affordable end, unvented systems (cylinder, G3 safety kit, discharge arrangements, commissioning) costing more but transforming shower and tap pressure. You'll get both options priced where both are viable.

Frequently asked questions

Who is allowed to work on an unvented cylinder?

Installation and work on the safety controls of an unvented cylinder are Building Regulations G3-controlled and must be carried out by a qualified engineer. All unvented work booked in Bristol through this site is tagged g3_required and routed only to G3-qualified engineers.

Is a leaking cylinder an emergency?

A weep at a connection is urgent but containable — isolate and book promptly. Water from the cylinder shell itself, or continuous hot discharge, warrants emergency attendance: isolate the cold feed to the cylinder and switch off immersion/heating first.

Do you cover all of Bristol for cylinder work?

Yes, including Easton, Fishponds and Redland — with G3-qualified engineers allocated for anything unvented.

Why is water coming out of the pipe near my cylinder (the tundish)?

On an unvented cylinder, discharge through the tundish means a safety control is doing its job — commonly a flat expansion vessel or a failed pressure-reducing valve. It needs a G3-qualified engineer, and your job is routed to one automatically. Don't cap or block the discharge pipe under any circumstances.