First post on here, Hi everyone.
I have just had my boiler replaced along with some rads repiped and a change of design to a sealed system. The old boiler was a very old Potterton netaheat that struggled to warm the house especially if someone had a bath and the hot tank needed reheating. The system also used to draw in a hell of a lot of air as it was piped wrong into the loft according to all the installers who came and looked at it prior to quoting, you could bleed all the rads and run the system and hear bubbles gurgling through the pipes like no tomorrow.
The rads were all piped using dual entry rad valves and 8mm microbore with the exception of 2 that were in the extension built in the 80's, these were on 15mm copper. The new boiler is a WB Greenstar CDi30.
The problem I perceive is this, when you fire up the heating from cold, the rads take 15-20 mins for the heat to start coming through and a further 20 minutes for the bottom of the rads to warm up. Its not sludge as the whole system was powerflushed and one of the rads is brand new.
The installers replaced the 8mm microbore downstairs with 10mm plastic pipe (not sure why they did not use 15mm) and changed all the dual entry rad valves over to TRV and lockshield.
Could the problem be the pump, could all those years trying to pump with large volumes of air have worn it out (grundfoss 15/50) ?
Will monitor this thread and reply to further questions if I have missed something but a little peeved cos I expected the heat of the rads to be far greater after all this work.
I have just had my boiler replaced along with some rads repiped and a change of design to a sealed system. The old boiler was a very old Potterton netaheat that struggled to warm the house especially if someone had a bath and the hot tank needed reheating. The system also used to draw in a hell of a lot of air as it was piped wrong into the loft according to all the installers who came and looked at it prior to quoting, you could bleed all the rads and run the system and hear bubbles gurgling through the pipes like no tomorrow.
The rads were all piped using dual entry rad valves and 8mm microbore with the exception of 2 that were in the extension built in the 80's, these were on 15mm copper. The new boiler is a WB Greenstar CDi30.
The problem I perceive is this, when you fire up the heating from cold, the rads take 15-20 mins for the heat to start coming through and a further 20 minutes for the bottom of the rads to warm up. Its not sludge as the whole system was powerflushed and one of the rads is brand new.
The installers replaced the 8mm microbore downstairs with 10mm plastic pipe (not sure why they did not use 15mm) and changed all the dual entry rad valves over to TRV and lockshield.
Could the problem be the pump, could all those years trying to pump with large volumes of air have worn it out (grundfoss 15/50) ?
Will monitor this thread and reply to further questions if I have missed something but a little peeved cos I expected the heat of the rads to be far greater after all this work.
