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Hot water cylinder

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The short answer

Unvented and immersion repair or replace

Price from
£80.00
Time on site
1 to 4 hours

What you get

You get a professional assessment of your hot water cylinder needs, including repair, replacement options, and a clear quote for the work.

  • Typical service: £80 to £150 a year
  • Includes testing safety valves and recharging the expansion vessel
  • Replacement valves are extra
Get up to 3 quotes

When do you need a Hot water cylinder?

You should book a safety check every twelve months for your pressurised hot water system.

  • Landlords must keep all water heating equipment in safe working order.
  • Most manufacturers require annual checks to keep your warranty valid.
  • You need this if you have no cold tank in the loft.
  • Regular checks prevent safety valves from leaking or failing.
  • The law requires these high pressure systems to be professionally maintained.
  • As a guide, expect to pay around £80 to £150.

What happens on the day

A qualified expert will visit to test all the safety parts on your tank.

  • They check the tank and pipes for leaks or rust.
  • The engineer tests the pressure and temperature relief valves.
  • They recharge the expansion vessel with air if needed.
  • The specialist checks the tundish pipe is clear and safe.
  • They test the thermostat to prevent bacteria and scalding.
  • You will receive a service record once they finish.

How to prepare

  • Clear all items stored around the cylinder
  • Ensure the engineer can reach the wall valves
  • Identify where your main water stopcock is
  • Check if your cylinder uses gas or electricity
  • Have your previous service records ready to show
  • Keep children and pets away from the work area
  • Ensure there is good lighting in the cupboard

How to improve your result

  • Insulate all visible hot water pipes
  • Check the thermostat is set to sixty degrees
  • Fix any dripping taps to save hot water
  • Install a timer to heat water only when needed
  • Look at the tundish monthly for any drips

Why it is useful day to day

A well maintained cylinder gives you better water pressure and lower energy bills.

  • Enjoy strong water pressure in every shower and tap.
  • Save money by ensuring your heater works efficiently.
  • Get peace of mind that your high pressure tank is safe.
  • Stop annoying drips from external overflow pipes.
  • Avoid expensive emergency repairs by catching small faults early.
  • Keep your hot water clean and free from harmful bacteria.

Why we ask these questions

Your engineer will explain how your system stays safe and efficient during the visit.

  • Why the safety valves are vital for high pressure units.
  • How the expansion vessel protects your pipes from bursting.
  • What the plastic tundish funnel shows you about your system.
  • Why the water temperature must stay at a specific level.
  • How a service record protects your home insurance and warranty.
  • Which parts might need replacing in the future.

Frequently asked questions

Often needed alongside

Hot water cylinder near you