Unvented Hot Water Systems
Expert Unvented Hot Water Systems from DJ Plumbing & Heating

How It Works
A Gas Safe engineer surveys the property, checks mains pressure and hot water demand, and specifies cylinder size, expansion arrangements and safety devices.
Why Choose us for Unvented Hot Water Systems?
Gas Safe qualified engineers
All gas work is carried out by Gas Safe-registered engineers, ensuring installations meet safety standards and are compliant for domestic properties.
Domestic-focused practical solutions
We size systems and fit correct expansion and safety arrangements for houses, tenement flats and modern builds so homeowners get reliable mains-pressure hot water.
Local, responsive service
Based near Glasgow with primary coverage in Dumbarton, we provide fast attendance, clear documentation and emergency support when customers need hot water restored quickly.
What we install: an unvented hot water system stores heated water at mains pressure and delivers high flow to showers and multiple outlets. Installations include the cylinder, expansion vessel, pressure relief and safety valves, temperature/pressure gauges, tundish and correctly routed discharge pipework.
Servicing & safety checks: regular servicing keeps relief valves and controls working and prevents nuisance discharges. Our engineers follow manufacturer recommendations and current building standards, provide clear commissioning paperwork and advise landlords and homeowners on maintenance schedules and emergency shut-off procedures.
- Correct expansion arrangements to protect pipework
- Pressure relief and temperature controls for safe operation
- Documentation for handover and future servicing
