Radiators cold at bottom

[Harvest Fields]

Haven’t read all posts, but have you tried balancing the system?

 

[Sam Egner]

Haven’t read all posts, but have you tried balancing the system?

Yes mate

 

[Sam Egner]

Well it could be either, as mentioned before we can't say for certain without seeing the job but you have poor flow to a couple radiators. Could be incorrect pipe sizing, could be too much restriction caused by numerous elbows in the pipe work. There could be isolation valves under the floor somewhere or a kinked pipe you may have faulty trv valves or partially blocked lockshieds. The list is endless. You've ruled out balancing and air locks. Consider taking the radiators off that aren't working and opening both the flow and return pipes to see what sort of flow rate your getting through the valve.

I see,

I’ve done this to a certain degree. The radiators get warm across the top and I can hear the water thumping in when I empty it and then fill it back up. It almost seems like the water is not being sucked out the opposite side to the TRV again sorry if this sounds silly but I’m not a plumber.

Appreciate your help and responses

 

[Riley]

Maybe a partial blockage

 

[Sam Egner]

Maybe a partial blockage

What’s the resolution to that? Powerflush?

 

[Riley]

Potentially. How dirty is the water?

 

[Sam Egner]

Potentially. How dirty is the water?

I wouldn’t say dirty more like a few table spoons of milk into a pint of water colour

 

[Riley]

Pint of what though. If Guinness you may have your answer

 

[Sam Egner]

Pint of what though. If Guinness you may have your answer

Water ^ haha.

 

[Riley]

That really makes no sense so you’re saying it’s cloudy??!

 

[Sam Egner]

That really makes no sense so you’re saying it’s cloudy??!

Yes - it is cloudy mate

 

[Riley]

Id say probably not blockage unless when you drain a rad and it’s sludged at the bottom

 

[Sam Egner]

Id say probably not blockage unless when you drain a rad and it’s sludged at the bottom

The rads that get warm at the top and stay cold at the bottom are virtually brand new maybe 3 months old

 

[Riley]

Doesn’t mean crud hasn’t moved in from pipework and older rads

 

[Riley]

Have you disproved the two rads teed off the same pipe theory I’ve lost track a bit

 

[Kevin David Greig]

I range rated my 34cdi was having a similar issue to you and this resolved the problem I have only 7 rads in the house and was pumping water into them at max output of 30kw so the boiler was short cycling.

 

[Riley]

Although we wouldn’t recommend changing the boiler settings unless you are competent to do so