Insulating tanks, pipes and radiators


Lagging water tanks and pipes and insulating behind radiators reduces the amount of heat that escapes, so you spend less money heating water up, and hot water stays hotter for longer. 


How much could you save?

Insulating your hot water cylinder is one of the easiest ways to save energy and therefore money. If you already have a jacket fitted, check the thickness, it should be at least 75mm thick. If not, it's worth treating your cylinder to a new winter coat. Fitting a British Standard jacket around your cylinder will cut heat loss by over 75% and could save you around £20-35 a year - more than the cost of the jacket!

By slipping pipe insulation around your exposed hot water pipes you’ll keep your hot water hotter for longer. Fitting insulation to pipes is easy if the pipes are accessible; if your pipes are hard to reach, you may need professional help.

Here are the figures:


Annual saving

DIY cost

Time taken to pay for itself

Carbon dioxide saving per year

Hot water tank top up insulation (25 to 80mm) Around £20-£35 Around £15 Around six months Around 90kg -120kg
Hot water tank jacket on an uninsulated tank Around £85-£130 Around £15 Less than six months Around 400kg - 570kg
Primary pipe insulation Around £10 Around £20 2 years Around 45kg

Savings based on a typical gas-heated home.


How to do it


A hot water cylinder jacket costs around £15, and fitting it is a straightforward job.

Pipe insulation are foam tubes that cover the exposed pipes between your hot water cylinder and boiler, reducing the amount of heat lost and therefore keeping your water hotter for longer. It's usually as simple as choosing the right size from your local DIY store and then slipping it around the pipes.


Radiator reflector panels

If you’re trying to save money on your heating bills and reduce your energy consumption, radiator reflector panels are an attractive low-cost option. Fixed behind your radiators, they reflect heat from the radiator back into the room, instead of letting the heat out through an external wall. They have most benefit when installed on uninsulated walls.

Getting water to your taps uses a lot of energy, especially when it's heated up - so using less water can save you a lot of money. Use our top tips to save water inside and outside your home.

Using water-efficient products is an easy way to make a difference. With most of them, you won’t even notice that you’re using less water!


Help for landlords

Until April 2015, the Landlord’s Energy Saving Allowance lets you claim up to £1,500 against tax for energy-saving improvements you have made to each house or flat you rent out. Find out more at the Directgov website.


Save money!

You’ll be charged a lower rate of VAT when you have energy-saving work done to your house, both for the materials and equipment, and for the labour. If the house is new, you pay no VAT at all. Find out more at the HMRC website.


Planning a home improvement project?