Hot Water Running Too Hot
Taps deliver water hot enough to be genuinely unsafe, particularly at the bath..
Taps deliver water hot enough to be genuinely unsafe, particularly at the bath.
What is actually going on
Taps deliver water hot enough to be genuinely unsafe, particularly at the bath.
The realistic causes, in order
A cylinder thermostat set too high or clamped poorly against the cylinder wall so it reads low and overheats the store A failed thermostatic mixing valve that no longer blends cold into the outlet A combi hot water setting turned to maximum with no blending at the tap
What we test on site
Delivered temperature at each outlet with a calibrated thermometer Thermostat position, contact and calibration on the cylinder Mixing valve operation and, where fitted, the blend setting against guidance
Get hot water that runs scalding diagnosed properly
Correct thermostat setting plus a functioning blending valve gives safe outlets without compromising the cylinder store.
Questions we get asked
Does hot water that runs scalding mean the cylinder needs replacing?
A cylinder thermostat set too high or clamped poorly against the cylinder wall so it reads low and overheats the store
What normally puts hot water that runs scalding right?
Correct thermostat setting plus a functioning blending valve gives safe outlets without compromising the cylinder store.
Is it safe to keep using the system with hot water that runs scalding?
Scalding is a real risk for children and older adults. Where a blending valve is fitted it should be delivering a safe temperature at the outlet, and store temperature still needs to be high enough to control legionella.