Why Would my Hot Water Cylinder Start Venting? Help and information on all topics relating to your central heating, air conditioning and ventilation issues.

[Danholker]

Hi. Does anyone know why my hot water cylinder has started venting? It's pouring hot water down the drain which seems like a lot of waste.

[dennispalmer]

There are mainly two reason behind the water heater cylinder venting as given below:
The pipework configuration is wrong and unless you have changed something.
A sludged up system causing a partial blockage making the open vent the easier route for the water to follow.

[ericmark]

Normally caused by faulty thermostat over heating the water. However there are some weird and wonderful system, like the Willis so more than one reason.