Faulty Cylinder Thermostat
Hot water that either never satisfies or never reaches temperature..
Hot water that either never satisfies or never reaches temperature.
What is actually going on
Hot water that either never satisfies or never reaches temperature.
The realistic causes, in order
A thermostat not making proper contact with the cylinder wall through the insulation A failed thermostat that never switches, so the zone valve never opens A setting left at an unsuitable temperature by a previous visit
What we test on site
Switching action at the set temperature with the cylinder heating Physical mounting and contact against the cylinder Actual stored water temperature versus the setpoint
Questions we get asked
Does a faulty cylinder thermostat mean the cylinder needs replacing?
A thermostat not making proper contact with the cylinder wall through the insulation
What normally puts a faulty cylinder thermostat right?
Thermostats are inexpensive, and correct mounting matters as much as the part itself.
Is it safe to keep using the system with a faulty cylinder thermostat?
Stored hot water needs to reach a high enough temperature to control legionella, with outlet temperature managed separately by blending where scald risk exists.