Thorn M 56/76 Boiler. Radiator "Hot" Water "N

[RayGreen]

As the subject heading indicates. My old Thorn boiler is doing a great job heating the radiators. But the hot water is only luke warm and that is with the thermostate turned right up.

Welcome your thoughts! Any assitance appreciated

 

[RayGreen]

Fitted a new thermostat. No change help!

 

[kevplumb]

is there water in the header tank

 

[RayGreen]

Hi Kev,

Yes water in the header tank. Just piping hot radiators and no hot water

 

[kevplumb]

has to be air in the pipework

 

[RayGreen]

A mate said he could hear the boiler "kettling" and suggested a drain down of the boiler and back flushing to remove the silt! Said silt in lower pipe work will stop the circulation in the hot water system

Does that make since. Nothing has been done to the boiler in the 10 years I have lived here.

Cheers Ray

 

[RayGreen]

Any ideas?

 

[ph]

What system have you got ?From what i can gather it is open vented to start with! Is it fully pumped or pumped heating gravity hot water?

 

[RayGreen]

Is it fully pumped or pumped heating gravity hot water?

There is only 1 pump for the radiators. The Boiler is downstairs and the hot water tank is upstairs in the bathroom.

Does this help!!

 

[kevplumb]

could try slackening the flow connection to the cylinder

or pull the boiler stat and boil it if your not sure about this DON'T

 

[ChrisR]

Look for a motorised valve sitting on a pipe somewhere. The motors "go" and they stay shut. It will be wired to the control box If it has a lever on the end to slide to "Man" and hook up, you will get (uncontrolled) HW.

 

[RayGreen]

Cheers Chris, will give it a try