Unvented Hot Water Systems
Unvented Hot Water Systems
How It Works
Site survey & design
A qualified engineer visits to assess mains pressure, hot water demand, cylinder location and compatibility with boilers or heat pumps, then proposes a system and layout.
Supply & professional installation
We supply the right unvented cylinder and ancillaries (expansion vessel, PRV, TMV, AAV) and install to manufacturers’ instructions and industry regulations.
Commissioning & certification
Full commissioning, safety checks and paperwork on completion — thermostat calibration, PRV testing, pressure checks and user handover with compliance certificate.
Why Choose us for Unvented Hot Water Systems?
Reliable high‑pressure hot water
Unvented cylinders deliver mains‑pressure hot water to multiple outlets without pumps, ideal for modern bathrooms, wet rooms and multi‑bath properties.
Qualified, compliant installation
Work is carried out by Gas Safe, CIPHE and City & Guilds qualified engineers with full commissioning and certification — we ensure systems meet current regulations.
Renewables‑ready & great value
Systems are compatible with air source heat pumps and partner solar installations; we offer a Price Match Promise and a referral reward for completed installations.
What we supply and fit — high‑quality unvented hot water cylinders (direct and indirect) sized to your household demand, plus all safety ancillaries: expansion vessel, pressure relief valves (PRV), thermostatic mixing valve (TMV), air admittance valve (AAV) and isolation controls. We design systems for houses, extensions and flats where mains pressure allows, and we specify compatible controls for connection to gas boilers, combis, air source heat pumps and partnered solar installations.
Commissioning, safety checks and service — every installation receives full commissioning, pressure and leak tests, PRV verification, expansion vessel pre‑charge, thermostat calibration and user handover with certification. Routine maintenance is recommended to retain performance and manufacturer warranties; our service visits include valve checks, gauge readings and TMV testing. For a site survey or to discuss a cylinder swap, call 07446 145647 or email ryan@blueflowheating.co.uk. Blueflow has 15 years’ experience and holds Gas Safe, F‑Gas, CIPHE and City & Guilds qualifications.