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The K3 is on a run with 2 small rads and a towel rail John they are all under an insulated floor, I will give it a go thanks again :-)

Sorry John it is a plus " a grey moment" I will do the checks TU

https://professional.vaillant.co.uk/for-installers/products/ecotec-plus-610-615-620-625-630-635-154880.html mine is the 625. I have a Hive system, there is one valve for HW the other CH up and down, I can't separate John. The original Valliant fitted 10 years ago was done by a Gas Safe engineer...

Hi John on the microbore upstairs fed by 2 x 22mm Manifolds 4 rads 2 towel rails, downstairs is 15mm 6 rads inc K3 and a towel rail. The Boiler is LPG Vaillant Ecotec Pro 625 installed by a gas-safe engineer 5 weeks ago, I installed the system when I built the house 1985-1988 the K3 is for an...

Hi John no I didn't measure with just the K3 in circuit. I am looking at the Trident https://www.tridentpumps.co.uk/product/automatic-boosting-pump-with-integrated-flow-switch/ , fitting it after the 2 port on the heating side only (S Plan) operating it from the 240v supply that opens the 2...

Hi John thanks I have checked and it is on 400mbar also there is a motor speed adjustment for when you need a bit more flow, I have screwed it as per installation manual and I have a more uniform heat on the outside panel. So I may fit an external pump to save the internal pump working harder.

Microbore only upstairs all downstairs is 15mm Madrab. I did know it was an old thread Anxious :-)

Me too same problem outer panel cooler at the bottom, if its a flow problem I don't understand as I have turned all the other rads off, and normally the new boiler heats 6 x 10mm microbore rads upstairs with no flow problems. Is a booster pump a solution Stem?

Hi thanks for replying 15mm pipework I have run with the valves open and various turns on the lock shield, the straight run to the rad from the boiler is app 10m, I had a K2 installed before with no problem I just needed a bit more heat, is a booster pump the answer if I ned more flow?

Hi all I have fitted the radiator the back and center panel are even heat but the front one is cooler at the bottom, I was told it was a flow problem but it is the only live radiator on my system the rest have been turned off, the boiler is a new Valliant 24 KW and the system had a power flush I...

Hi John they are both 14"

Hi John they are both 14"

If this is a lame question sorry! On dipping the tank when I fitted the Thermowatt learning immersion/stat there was another 100mm of depth, why don't they fit a longer immersion?

Hi Rob thanks for the info :-) so in effect, if the boiler is not switched on the bottom of the tank will never get hot using the immersions? warm maybe?

Thank You, The tank was installed by a qualified engineer with a certificate, the electrical side is not down to a plumber, I have had 55+ years in all forms of the electrical/electronics trades so I am happy to do my bit and get it checked. I built my house it took me 3 years and "all the trade...

Hi John the first of Madrabs sketches is the right layout and the second immersion is in the same location at the other end. I appreciate you guys helping ;) and I am trying to grasp the way the tanks water circulation works! still trying :rolleyes: The tank stat was closed this morning after 7...

Hi John the second immersion was a special order, sorry to confuse but I swapped the immersion stats over to eliminate any problem. Yes the HW is working as it should John the boiler is set to 70, I suppose I was expecting the immersion to share a bigger proportion of keeping the tank charged :(...

Hi johntheo5 this is the beast https://www.telford-group.com/product/horizontal

Hi Madrab thanks for the input and understand the logic behind it, and yes it is indirect, my idea is to use the off-peak times with 1 or 2 immersions and the boiler to do the main heating, I think I am wasting my time trying to get the stats to work at the same temp, I have a smart Thermowatt...

I changed the thermostats over same situation the tank stat is still calling for heat. As the tank stat is at the near bottom of the tank I am wondering if they will ever be more or less the same? and be content with the boiler doing most of the heating?