Smart Home Energy 
If your hot water cylinder is bare or has a tatty old jacket, this 80mm insulation wrap pays for itself in weeks by stopping heat radiating into the airing cupboard — takes 20 minutes to fit, no tools, and renters can take it with them.
Problem it solves
Reduces heat loss from hot water cylinders, cutting the cost of reheating water that would otherwise radiate into the surrounding space.
Who it's for
Homeowners or renters with an uninsulated or poorly insulated hot water cylinder, especially those with electric immersion heaters or gas boiler systems where the cylinder is in an unheated space.
Why we recommend
A no brainer if your hot water tank doesn't already have a jacket. Fast payback.
Savings
- Typical annual saving
- £15–£366/year depending on existing insulation thickness and heating method (electric immersion vs gas boiler)
- Payback period
- Less than 3 months for uninsulated cylinders; 1–2 years when adding over existing thin insulation
