Water pressure troubleshooting guides
Identify water pressure problems including low mains pressure, boiler pressure drops and fluctuating system pressure.
Common problems
Low water pressure throughout the house: where to start
Advice Hub / Water Pressure Low water pressure throughout the house: where to start Check time: 5–10 minutes • Difficulty: Easy checks • Safety: Low risk Quick answer If water pressure feels low across the whole house rather than at just one tap, the cause is more likely to be your stopcock, mains supply, or…
Expansion vessel failure explained
Advice Hub / Water Pressure Expansion vessel failure explained Check time: 5 minutes • Difficulty: Easy checks • Safety: Low risk Quick answer An expansion vessel is a component that absorbs the extra volume of water as it expands when heated, helping keep pressure stable in a sealed central heating system. When it fails, pressure…
PRV valve discharge explained
Advice Hub / Water Pressure PRV valve discharge explained Check time: 5 minutes • Difficulty: Easy checks • Safety: Low risk Quick answer The pressure relief valve (PRV) is a safety device that releases water from your heating system if pressure gets too high, protecting the system from damage. If you notice water dripping or…
Water pressure dropping when a tap runs: what it can mean
Advice Hub / Water Pressure Water pressure dropping when a tap runs: what it can mean Check time: 5–10 minutes • Difficulty: Easy checks • Safety: Low risk Quick answer If pressure noticeably drops at one tap or fixture when another is turned on elsewhere, this is often about how flow is shared across your…
Boiler losing pressure overnight: what it can mean
Advice Hub / Water Pressure Boiler losing pressure overnight: what it can mean Check time: 5–10 minutes • Difficulty: Easy checks • Safety: Low risk Quick answer If your boiler’s pressure is noticeably lower each morning, this pattern often points to a slow leak somewhere in the system, since heating is usually off overnight so…
Low mains water pressure: what to check (before buying a booster)
Advice Hub / Water Pressure Low mains water pressure: what to check (before buying a booster) Check time: 5–10 minutes • Difficulty: Easy checks • Safety: Low risk Quick answer Before assuming you need a booster pump, check whether low pressure affects the whole property or just one tap — that single check tells you…