Mains-pressure hot water at every tap
With an unvented cylinder, both hot and cold water reach your taps and showers at mains pressure. Strong showers everywhere, fast-filling baths and no tank in the loft.
- Gas Safe
- 543776
- Since
- 2010
- Emergency
- 24/7
Cold mains water is fed into the base of the cylinder and heated. When you open a tap or shower, mains pressure pushes the hot water out, so hot and cold arrive at balanced pressure throughout the house.
There’s no cold-water storage tank, so no risk of contamination, nothing to freeze in the loft and drinking-quality water at every tap. Recovery is fast, typically 15–20 minutes for a 125-litre cylinder.
Unvented cylinders store hot water under pressure, so they must be installed and serviced by a qualified engineer. We’ve been installing them for over 10 years.
What’s included
- Balanced hot and cold pressure
- High-performance showers throughout
- Fast-filling baths
- Drinking water at every tap
- No loft tank, no frozen pipes
- Quiet running, fast recovery
What size cylinder do you need?
A guide based on typical use. We confirm the size, your mains pressure and flow rate on a free survey.
How it works
- 01
Assess
We check your mains pressure and flow rate. It needs to be good enough.
- 02
Size
Cylinder sized to your household and bathrooms.
- 03
Install
Cylinder, safety controls and discharge pipework fitted to regulations.
- 04
Annual check
Safety valves and expansion tested every year.
Questions, answered
Can’t see your question? Call 07702 155 576. You’ll speak to an engineer, not a call centre.
Is my mains pressure good enough?
Most homes are fine, but we always test pressure and flow before recommending unvented. We’ll tell you honestly if it isn’t suitable.
What size cylinder do I need?
Use the sizer on this page for a guide. Roughly, a family of four with two bathrooms suits 210–250 litres.
Does an unvented cylinder need servicing?
Yes, every year. The safety devices need testing to keep it safe and keep the warranty valid.