Why is my bath water not hot enough?

Question

The bath water starts warm but goes cold quite quickly, even when running it on full hot. The shower seems fine. Is this a cylinder issue or something else?

Liam · Answer

Is this on a new-build by any chance? If so, it's now regulations that a thermostatic mixing valve is fitted to a bath which causes water temps of roughly 42c.

If it isn't a new build it could well be a heat source issue but if you're getting hot water to the kitchen and bathroom basin then that would indicate that the cylinder or boiler is fine.

Aaron · Answer

Could you check whether the hot tap at the basin is running at a good temperature, and also make sure the boiler’s hot water setting is turned up high enough? It’s also worth trying the bath tap on a slower flow to see if the temperature improves. If everything else is working fine, the bath mixer is likely blending in too much cold, which is a common issue.

Current UK regulations require bath hot water to be limited to 48°C for safety, which is controlled by a thermostatic mixing valve. If the bath isn’t getting hot enough, it may be the mixer over‑blending cold water.

Why is my bath water not hot enough?

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