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High-Performance Hot Water for Your Home
If you\'ve ever experienced the frustration of weak showers, waiting for hot water, or losing water pressure when someone else turns on a tap, an unvented hot water cylinder could be the solution you\'ve been looking for. At Kesselmann Heating and Plumbing, our G3 qualified engineers specialise in the installation and servicing of these high-performance systems.
Unlike traditional vented cylinders that rely on gravity and a cold water tank in the loft, unvented cylinders are connected directly to the mains water supply. This means hot water is delivered at full mains pressure to every outlet in your home – giving you powerful, consistent performance that transforms your daily experience.
Mains Pressure Hot Water
Powerful hot water at every tap and shower throughout your home.
Multiple Showers
Run multiple showers simultaneously without losing pressure.
No Pump Required
Eliminate the noise and maintenance of shower pumps.
Renewable Ready
Compatible with solar thermal panels and heat pumps.
The Difference Mains Pressure Makes
The main benefit of an unvented system is simple: powerful hot water everywhere. Traditional gravity-fed systems often struggle to deliver adequate pressure, especially to upstairs bathrooms. Many homeowners add pumps to compensate, but these add noise, require maintenance, and increase energy use.
With an unvented cylinder, you eliminate these problems. Hot water flows at mains pressure naturally, giving you:
- Powerful, invigorating showers without a pump
- Quick-filling baths, even on upper floors
- Consistent pressure when multiple outlets are in use
- Better performance from high-end showers and taps
- No loft tank to freeze, leak, or attract contamination
- More usable loft space
Safety and Compliance
G3 Qualified Engineers
UK regulations require that unvented hot water cylinders are installed and serviced only by engineers holding the G3 (Unvented Hot Water) qualification. All Kesselmann engineers are fully G3 qualified, ensuring your installation meets all safety standards and building regulations.
Because unvented cylinders operate under pressure, they incorporate multiple safety devices:
- Temperature relief valve – releases water if temperature exceeds safe limits
- Pressure relief valve – releases water if pressure exceeds safe limits
- Expansion vessel or internal air bubble – accommodates water expansion as it heats
- Tundish – visible discharge point to alert you if safety valves activate
Annual servicing is essential to test these safety devices and ensure they\'ll work correctly if ever needed. This servicing requirement is a condition of most manufacturer warranties.
Installation Process
Every unvented cylinder installation begins with a survey to assess your mains water pressure and flow rate, determine the best cylinder size for your household, and plan the installation. If you\'re replacing an existing cylinder, the work is usually completed in a single day. Converting from a vented system may take longer.
We supply and install cylinders from leading manufacturers and can recommend the right capacity based on your household size and hot water usage patterns. Whether you need a compact 150-litre unit for a small household or a larger system for a busy family home, we have you covered.
Renewable Energy Compatibility
If you\'re considering solar thermal panels or a heat pump, an unvented cylinder is an excellent choice. Many models feature twin coils or additional immersion connections specifically designed for renewable energy integration. This future-proofs your hot water system and can help reduce your energy bills and carbon footprint.
Ready to upgrade your hot water experience? Call Kesselmann Heating and Plumbing on 07388 494676 to discuss unvented cylinder options for your home.