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I think you are on the correct track in relation to pipe runs and lengths. I need to look into that further. Thanks for your advice on the booster pump and noted.

Hi, I isolated the hot water under the kitchen sink and turned on the hot tap and no water come out the tap. There is no isolation valve in the cylinder outlet pipework. Question if I may. Could a booster pump be fitted in the HW outlet pipe from the cylinder ?. I appreciate that the cylinder is...

Will do.

Sorry for the late reply. I shut off the incoming mains cold to the cylinder and all sinks in the house stopped running cold water. So I am assuming that the control group is maintaining 3bar pressure for both hot and cold to the house ?. Taps to all sinks are lever mixers so the kitchen and...

Good morning Johntheo5. Thank you for replying. A valve such as that is installed and with the mains connected as your picture. There looks to be several connections from the outgoing side with one of them going to the cylinder. It has the expected 3bar marking on the valve which I believe is...

Hi all, Recently moved into a refurbished house and having issues with hot water delivery to "some" taps ?. New 2023 installation of heating system and hot water. Heating fine via Vaillant ecoTech plus 630 coupled to a Tempest indirect 300L cylinder. Cylinder gets hot as required but : Kitchen...

Thank you. I will give this a try tomorrow and let you know.

Well, the pump was stopping before the anti cycle time elapsed. So my thought was that the heating water still needed to circulate rather than the pump keep stop starting as well ?.

Thanks Johntheo5, Flow temperature set at 62C. anti cycle time 20C, actual 6 mins. Boiler flow temperature at end of anti cycle 38C. Boiler then fires up and within seconds hits 67C and back into anti cycle. I have already increased pump over run time to keep circulating whilst in anti cycle...

After conversation with Vaillant technical who said my 424 ecoTEC plus has an output range of 12kW to 24kW the manual in fact says VU 246/6-5 OVZ (H-GB) 24kW Effective output range (P) at 50/30 °C 6.3 to 25.7 kW Effective output range (P) at 80/60 °C 6.1 to 24.6 kW 6.1kW still seems high. I...

Hi Johntheo5, Just called Valliant technical support and they tell me my boiler a 424 ecoTEC plus, modulates between 24Kw and 12Kw. Ie 12Kw is the lowest. That cant be correct can it ?????

Thank you also Johntheo5, I am glad to hear my interpretation of a overheat / anti cycle concern is more like the boiler sensor saying no heat required and going into anti cycle. I must admit that it has probably been doing this for some time. It looks to be a demand to minimum output setup as...

Point taken Madrab. Thank you for the ongoing advice which is appreciated. I most likely need a "pro" to come and check / set the system up as there looks to be an imbalance somewhere. I am doing some load calculations presently and that the downstairs rads equate to 10.18 Kw. The TRVs are...

Polished chrome valve caps for manual opening and closing of Drayton TRVs. Suitable for chrome towel rails and radiators. ( Screwfix )

Morning Madrab, thats my thinking as well. I have tried taking a couple of TRVs off and using the Drayton " manual" cap so effectively two more rads stay open with a trickle demand. Made some difference but not enough to stop the boiler from shutting down / anti cycle ?.

Thanks Madrab, Boiler goes to set temp of 62 and then pass to 67 and into anti cycle. Room stat has rads with lockshields, no TRVs. Anti cycle set at 25 mins but Vaillant graph shows in real time this equates to 6 mins ??

Thanks Notch 7. Something is clearly wrong and yes hopefully a pro can help.

Hi, I have a Vaillant ecoTEC plus 424 ( 24KW ) boiler feeding three circuits. Down stairs heating, upstairs heating and hot water via thermostats and motorized valves. There are twelve rads and two towel rails. All rads have TRVs except the one in the entrance hall. Both towel rails on...

Thanks Madrab, poor mains incoming water pressure unfortunately. New hot water , vented, cylinder installed last year with heating system upgrade. It seems just the cold is running out when in higher demand. I think doubling up as cross thread said is my best option.

Many thanks cross thread.