Keeping old boiler and adding new pump

camills

The heating has been on for a while now so I checked the radiators and they are all hot at both ends and top to bottom. A couple of them are a little less hot at the bottom.

plumb1_2

camills wrote: »

The pump is on 2, not on 3 at the moment.

Be careful turning the pump up the No3, looking at the way the system is piped up?????? It looks to me that the cold feed is connected to the pipe on the R/H side so it might push the water upto the header tank. Maybe it has been doing that?? why you have rust coloured water.

IMO it is piped up badly Vent and feed wise, and no bypass.

southcoastrgi

i was hoping the 15mm was to a rad or towel rail & the OP had a combined feed & vent, but yes when i first saw it i thought the same as you

keystone

Concur with above. Vent is in correct place via-a-vis pump but is poorly piped unless its a combined feed and vent and even then its questionable. If that 15mm on RHS is the feed its in the wrong place vis a vis pump and valve.

Changing pump speed might also upset system balance as regards temp differential twixt flow and return @ boiler so I wouldn't.

Where is your cylinder?

Cheers.

camills

So, I will leave it as it is then, won't change it to 3. :-)

The pump is next door to the bathroom in a cabinet and the cylinder is downstairs in a different cabinet.

Thanks