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Ok if in the same 'zone' as the main control unit (which has the temperature sensing part inside) unless I've missed something?

Telling/thanking for the relay box and standard one valve suggestion :)

5 zones. 4 study bedrooms (each individual) Open plan common area (one zone) Bathrooms can be always on with standard TRVs to limit temperature rise. If it were a private home with more regular hours/only sleeping in the bedrooms it'd be 2 zones (bedrooms, communal) with bathrooms...

What's the alternative solution for zoning a blank canvas? Looked briefly as this gear: http://www.ebay.co.uk/itm/271455065018 https://www.aqualec-ufh.co.uk/index.php Manifolds and actuator heads are cheap but where are the pukka controls?

The house is presently a blank canvas (ex electric ceiling heating) so can be plumbed to suit.

Honeywell evohome: http://www.evohome.info/ The base unit isn't outrageous but the eTRVs are costly. £200 question: can we do the following? Fit the base unit in the open plan kitchen/living room/diner then use the base unit to control that zone. Fit standard TRVs in the two...

It wouldn't work that way though. It'll flow less water but at a higher temperature - still using the full boiler output - with the shower making up the difference by blending in cold. It would avoid the showers running cold when incoming mains is <10C. Easy enough to experiment with after...

Thanks muggles, I think I follow now. Provided hot water temperature stays high enough (restrict flow to/from the boiler) the thermostatic mixer can/will shift the balance from cold to hot so that it maintains the set temperature. Without the restrictor the boiler outlet temperature can...

Aha! So tee off for toilets/white goods/outside tap/kitchen tap before the flow restrictor, then run the combi feed and the cold feed to showers/taps through that flow restrictor. Therefore combined flow must be <15L/minute (hot and cold) and the showers can do as they please. As the cold...

Hi, Large combi boiler. (nominally 15L/min @ 35C dT) I'd like to hang two mixer showers off it: running at 9-12L/min when used individually and sharing the boiler output when run simultaneously. The combi element is non-negotiable. We aren't getting an unvented system for the...

Thanks Richard - I'll go with these for distribution to the rads :-)

These manifolds: http://www.toolstation.com/shop/Heating/Pipelife+Manifold+System/Plain+Manifold+4+Outlets+34+Header/d230/sd2828/p88680 What's so special about these end fittings...

necropost? FWIW the O-rings in the "processor module" have all gone hard or have scale on them. Common (design) fault. 3 hours and 20 pence in parts to fix until next time. Aqualisa don't sell parts. You'll have to pull it apart, dig out the o-rings, and order them yourself. There is no...

Hello! Spoke with Highways @ Cambridge (County) Council. They've now been, unblocked the gulley nearest my house, spotted that second gulley that I hadn't and unblocked that too. More than enough drainage for the area according to your calcs (many thanks for those!) now that those gullies...

There's one gulley on the footpath/next to the wall at the side of my property, which drains into a clay drain. This drain is clear and the (high) level is set by the "trap" in the drain. (it's a pot with a flat bottom and a side exit that goes up before going down, much like a toilet bowl...

Thanks folks. House (all of Arbury) is late 1950s council housing. Garages are concrete prefabs. I think they're newer but will ask the little old lady down the way who remembers the lot being built... :-o Results of 6 mm of rain today: I'll ask he highways lot (Cambridgeshire...