- 10 Mar 2007
- Reaction score
- Poole, Dorset
No.Is the thinking that I need to bridge 1 and 2 (hot water off and heating off)?
HW off is only used on Y plan systems with a 3 port valve.
CH off is rarely used for anything.
Gravity systems are typically old floor standing cast iron boilers with large pipes to the hot water cylinder. Circulation occurs due to convection (hot water rises). There is no pump.
Unrelated to how the hot water actually gets to the taps.