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You haven't said yet where your 3-port valve is! Sorry about that, in the airing cupboard, where all controls (Hive receiver, wiring block) are. I think the temperature is adjusted on the boiler, then by regulating the flow and temperature according to the weather, to ensure the boiler is...

I think 4 pipe is a Veissmann thing, to efficiently prioritise hot water when using WC, as far as I can gather from other forums.

Here's some links to the item I was referring to: https://viessmanndirect.co.uk/files/de36168a-6a60-42b9-b0e4-ada60112a767/WB1B%20Compact%20Outdoor%20Sensor%20Instructions%20-%20Mod.pdf...

Hi fixitflav I found this information in another forum, I'm presuming this system is what you are referring to, or something similar ? I looked at the installation instructions, and it just requires some wiring changes, and another cable from the connector block in airing cupboard to boiler...

Thanks for the reply. He said the hot water needed to be monitored separately, to get the correct flow rate monitoring the outside temperature, so it could heat up the tank independently of the heating, at least that was my understanding of it, but I'm not a heating engineer, so not sure. This...

Yeah, the pressure was measured at my outdoor garden tap, which is basically a B and Q hose which is clamped to the water pipe in the kitchen, one of those garden tap kits. The mains comes in there under the sink. When I run the kitchen tap, the pressure seems much better than the garden tap...

Hi thanks for the reply, he said he couldn't fit a combi, because when he measured the mains water pressure, it wasn't high enough?

The 3 port valve is located in the airing cupboard, next to the hot water cylinder, is that what you were asking? It is the old copper type with brand new insulation that I fitted on there. Not sure what fast recovery is, guessing its not. I suppose what I'm really asking is, do I need hot water...

Hi everyone, I have had an independent survey carried out to replace my current 30+ year old boiler. It is a Y plan system, with 10mm radiator piping and 6 radiators. It is controlled by a Hive system. The only hot water usage is for a bathroom and kitchen sink, we have an electric shower - no...