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Well I tried the radiator balancing, no joy (but interesting - had not thought about this before). This morning have just completed hot swap of both valves (very little water spilt - good fun) - problem was definitely the thermostatic one not opening fully - and now all rads hot again. THANK...

Found a good diagram here-- www.kermi.com/en_com/thermal-comfort/hydraulic-balancing/ well thats worth a try too before the weekend - i would guess i have an upstairs 15mm circuit, and a separate 10mm downstairs circuit. And the offending radiator is the furthest from the boiler...

Its a gravity fed system, boiler is downstairs in the kitchen. Connecting valves via a hose is a new idea, however just as easy to just open one with a towel over it and i'll soon see if its not working? What's a balancing issue? This hasn't come up in my reading, what needs balancing and where??

Pin seems go to in & out -- well will be replacing both valves anyway.

So I have a 2 bed house, with gas central heating. Upstairs are 2 bedroom and 1 bathroom radiators (on 15mm pipe), downstairs 1 big lounge rad and one small one in hallway, both on 10mm pipe (no idea why they are different). Anyway, the 2nd bedroom upstairs radiator never heats up, at all. Both...

I'm in Danbury (near Chelmsford) in Essex

Can you identify this gravel / grit please ? (my mother wants her driveway gravel topped up a bit - so obviously I need to find the same make of grit). It looks grey / blue 2-4mm grit... (thanks in advance)

I've replaced my old honeywell controller and thermostat with a Hive system. Its all running and working, BUT when I move house, I intend to take the Hive with me (sorry, scottish genes). So I'm keeping the thermostat wires in the wall and will reconnect before I sell. So, the old honeywell...