We live in a late 80s house which had a boiler with two tanks in the loft which topped up the radiators and the immersion heater. There was/is a 3 port valve next to the immersion heater which would actuate on demand. The programmer was a mechanical Glowworm which failed pretty much straight away and was replaced with a Siemens Rwb9, at the time I assumed that the system was gravity due to the tanks and toggled pin 5 accordingly.
New system boiler fitted 12 years ago with the CH tank removed from the loft but retained the cylinder and tank. Programmer retained.
Another 10 years later and the programmer display has failed, therefore I have bought the newer version, RWB29Si and began to wonder whether I have a gravity or fully pumped system. It would appear that toggling between the two results in independent on status for HW and CH in fully pumped and restricted to HW on with CH or HW only on gravity. The latter is what is I was told how the system behaved in that you couldn't just have CH on. I'm not sure why I can't as the system appears fully pumped but wonder if it's due the electronics of the system?
In use, I have either the heating and/or CH pumped from the Remeha Avanta 24s boiler via the 3 port valve
I currently have a Honeywell TR6 managing the CH, the programmer is in Manual On mode for CH and HW, the issue I have is the cylinder calling for heat in the early hours.
Ideally, I would like to leave CH in Manual On and HW on timed, I suspect this may be possible in fully pumped but not sure if this is not applicable to my system type and I need to leave it in gravity mode.
All advice greatly welcome.
Edit.. Edited to say you couldn't just have CH on
New system boiler fitted 12 years ago with the CH tank removed from the loft but retained the cylinder and tank. Programmer retained.
Another 10 years later and the programmer display has failed, therefore I have bought the newer version, RWB29Si and began to wonder whether I have a gravity or fully pumped system. It would appear that toggling between the two results in independent on status for HW and CH in fully pumped and restricted to HW on with CH or HW only on gravity. The latter is what is I was told how the system behaved in that you couldn't just have CH on. I'm not sure why I can't as the system appears fully pumped but wonder if it's due the electronics of the system?
In use, I have either the heating and/or CH pumped from the Remeha Avanta 24s boiler via the 3 port valve
I currently have a Honeywell TR6 managing the CH, the programmer is in Manual On mode for CH and HW, the issue I have is the cylinder calling for heat in the early hours.
Ideally, I would like to leave CH in Manual On and HW on timed, I suspect this may be possible in fully pumped but not sure if this is not applicable to my system type and I need to leave it in gravity mode.
All advice greatly welcome.
Edit.. Edited to say you couldn't just have CH on
Last edited: