Confused about single channel controller

[D_Hailsham]

The C11 is a programmable thermostat, which is why it's single channel.

I hope it's not, as it's fitted in the airing cupboard in photo. Unless there's more than one model of Horst. C11, it's defo a single channel programmer.

I was muddling it up with the C-Stat 11.

 

[D_Hailsham]

Close up pics are useful, but a single pic showing a general view would be more helpful as we can then see how everything connects together.

 

[picasso]

I have seen this set up before, the single channel timer connects to both cylinder and room stat, I reckon the zone valve is only to stop unwanted circulation when the gravity hot water is running so I would go for a faulty cylinder stat.

 

[Whitespirit66]

The C11 is a programmable thermostat, which is why it's single channel.

I hope it's not, as it's fitted in the airing cupboard in photo. Unless there's more than one model of Horst. C11, it's defo a single channel programmer.

I was muddling it up with the C-Stat 11.

Understandable. This thread gets more confusing as it progresses.

 

[Missd99]

I hope it's not me making it even more confusing 😄

Surely fitting a double channel controller won't work as only have 2way valve upon inspection?

Today I phoned estate agent and have asked him to call previous owners to ask how they used to heat hw in summer.
No point asking if there was something wrong with hw when sold house ( temp rectified by valve switched to manual) as they'd never own up!
Thanks for help!

 

[D_Hailsham]

Surely fitting a double channel controller won't work as only have 2way valve upon inspection?

It would work if it was gravity circulation on the HW circuit. It's know as a 'C Plan' system

No point asking if there was something wrong with hw when sold house (temp rectified by valve switched to manual) as they'd never own up!
Thanks for help!

I know it's an additional expense (say £60-120) when purchasing a house, but it's always advisable to get a report on the heating/HW system from an independent heating engineer. You then don't have any nasty surprises.