Hot water cylinder jacket
The short answer
Insulate tank and pipes
- Price from
- £15.00
- Time on site
- 15 minutes to 1 hour
What you get
You get a more energy-efficient hot water system, reduced heat loss from your cylinder, and lower water heating costs.
When do you need a Hot water cylinder jacket?
You need a jacket if your tank is bare metal or feels warm. Modern rules say tanks should have plenty of insulation to save energy.
- Fit one if your tank feels warm
- Use one for thin factory foam
- Replace old torn or dusty jackets
- Get one to improve EPC ratings
- Landlords need them for efficiency rules
What happens on the day
A pro will check your tank size and look for any leaks first. They wrap the jacket tightly to ensure no heat escapes through gaps.
- Professional measures your cylinder size
- Jacket panels wrapped around the tank
- Straps pulled tight for a snug fit
- Small holes cut for pipe access
- Thermostats kept clear for safety
- Often includes lagging for nearby pipes
How to prepare
- Clear items out of the airing cupboard
- Ensure the tank is easily accessible
- Check the tank for existing leaks
- Identify where the immersion heater is
- Wipe dust off the cylinder surface
- Make sure there is floor space
- Provide a clear path for the pro
How to improve your result
- Add foam lagging to nearby pipes
- Check your cylinder thermostat settings
- Insulate the cold water tank too
- Bleed your radiators for extra warmth
- Upgrade to a smart heating controller
Why it is useful day to day
A good jacket makes your home run much more efficiently every day. It is a small change that offers big rewards for your wallet.
- Water stays hot much longer
- Cupboard stays at a better temperature
- Lower monthly heating bills
- Boiler or heater runs less often
- Reduces your home carbon footprint
Why we ask these questions
Getting the right fit is vital for safety and saving money. A pro ensures the jacket works perfectly without causing any electrical issues.
- Jackets should be 80mm thick
- Covers must be fire retardant
- Immersion heaters need to stay clear
- Proper fit prevents heat loss gaps
- Professional fitting ensures maximum bill savings
Frequently asked questions
Often needed alongside
New windows
uPVC, aluminium, timber, sash
New external doors
Front, patio, bifold, French
Conservatory & orangery
New build or roof replacement
Loft & roof insulation
Loft, room-in-roof, rafters
Wall insulation
Cavity, internal or external
Floor insulation
Suspended and solid floors
Flat roof insulation
Warm deck upgrade
Faulty insulation removal
Spray foam or failed cavity fill

