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I know I'm being picky, but I just want to understand clearly what the regs say and how to implement them. You are right that the diagram I posted comes from BR H, section 2.24. However, that says "... at any points where pipes are built into a structure, including ... footing ... or wall"...

This is the picture from the regs. I don't think I'm trying to combine the two methods. Mike.

Building pictures

Thanks Marshman for a useful explanation. However, that is not what the regulations require. Diagram 7 in H1 of the drainage regs says that the sheet material is there is keep the fill and vermin out of the duct through the foundations. That is because any differential settlement between the...

Surely that will only last a few years underground? Mike.

I'm building a largish extension which will have a new soil pipe which must pass through the new foundations. Building regs say that this should pass through a duct which should be sealed with foam and the ends covered with sheet material, I think to keep out vermin and stop the infill from...

Obviously I already have the plumbing configured with the zone valves to split the system into the three zones (as I did this 15 years ago) and clearly I will still need three temperature sensors but one controller could read all three and control the three zone valves, mixing valve and boiler...

Thanks for the inputs. I do understand that I would need a mixing valve. Going back about 15 years Yorkpark used to do this as standard but I think they went bust; hopefully no connection... The Honeywell CM programmable thermostats are no more advanced than the ones I have had for the past...

Thanks for the vote of confidence in Grant. What I really want in a controller is for one system to do everything, so it manages the three zones AND does the load compensation. I think this has to be better than separate systems. There does seem to be a lot of confusion about load vs...

I am planning to replace my old boiler with a new oil boiler. Gar is not an option where I live. I want to maximise the efficiency of the system controls. I already have three heating zones (living areas, bedrooms and bathrooms) and would like a controller which could manage these zones...