88v8
Member
- Messages
- 3,129
- Location
- Glorious Gloucs
Just to mention what I'm sure you already know, the gravity circuit will be permanently at the same temp as the pumped circuit, which is presumably 180F flow and 160F return. It follows that the rad upstairs (in the bathroom?) will be always hot.
The rad must not have a trv or motorised valve, ie it must be an open loop.
To prevent visitors from turning it off - 'too hot in there' - it would be advisable to have no handwheel, or at least to remove it to a place of safety.
I guess the rad will be quite big, if it has to remove the residual heat from what I presume is a decent size stove.
We found the open loop rad in our bathroom in our previous (boohoo) house very handy for drying towels etc in the summer. You might wish to consider whether you could usefully split the loop so as to have permanent heat in more than one place.
If I had been redesigning the circuit in that house I would also have have had a downstairs rad connected to the HW circuit so as to have some warmth in the downstairs loo/basin room for towel drying when the CH was off.
I presume that the pump will have an overrun control, such that it will continue running after the HW or CH has called 'off'. This will prevent kettling.
When I first installed our heating, I made it overrun using a stat on the main return pipe, and a relay so that the pump ran until the return water in the main pipe had cooled. It took, from memory, 15/20 minutes when the system was heat-soaked.
Ivor
The rad must not have a trv or motorised valve, ie it must be an open loop.
To prevent visitors from turning it off - 'too hot in there' - it would be advisable to have no handwheel, or at least to remove it to a place of safety.
I guess the rad will be quite big, if it has to remove the residual heat from what I presume is a decent size stove.
We found the open loop rad in our bathroom in our previous (boohoo) house very handy for drying towels etc in the summer. You might wish to consider whether you could usefully split the loop so as to have permanent heat in more than one place.
If I had been redesigning the circuit in that house I would also have have had a downstairs rad connected to the HW circuit so as to have some warmth in the downstairs loo/basin room for towel drying when the CH was off.
I presume that the pump will have an overrun control, such that it will continue running after the HW or CH has called 'off'. This will prevent kettling.
When I first installed our heating, I made it overrun using a stat on the main return pipe, and a relay so that the pump ran until the return water in the main pipe had cooled. It took, from memory, 15/20 minutes when the system was heat-soaked.
Ivor