Nickfromwales

Ffs.

Use the fish key to isolate a triple pole relay?

Check with the sparky about exporting the earths. What will be the distances between the MET and the final CPC connections at all CU’s? PME?

Bath water has a lot of gravity assistance, showers need to have free-flowing discharge as they have next to no gravity to help get things gone. Agree, get them to pull it out and do as the MI’s suggest, even more so if two showers are on one unit

50mm every time. It’s big enough to create an air break over the discharging water / suds, whereas 40mm often won’t discharge anywhere near as free-flowing as with 50mm as the entire bore fills with water / suds and stalls. Makes a huge difference if there is even as little as 1000mm or so of horizontal run.

Can you upload a sketch of the waste pipework and show where your AAV is fitted? Also, you can get anti-siphon ( AAV ) traps for sinks and baths, so there may be some easier fixes available before you go to the lengths of adding a vent to atmosphere.

Installation costs most prob eg boiler etc + £400

https://www.ebay.co.uk/itm/Generation-6-Samsung-Air-Source-Heat-Pump-16kW-Capable-of-65-C/223765085822?epid=1960183766&hash=item3419703e7e:g:5nkAAOSwzDFb4ddf

Static mains pressure needs taking over 24 hours. Put a non return valve on the pressure gauge so the peak value is preserved. Then the dynamic flow rate in L/p/m with the outside tap for eg open fully. Zimlet via Anchor Pumps Ltd are robust and competitively priced. 2-300L is pretty much every level for a domestic dwelling as these only hold 50% or less of their volume as usable energy.

The bottom line is, the UVC is cold mains dependant, so hot water flow would reduce if even just the washing machine was filling. Ive installed a number of cold mains accumulators in dwellings where I expected this to be overly problematic, to combat this very issue. If you’ve not hit a very good cold mains then perhaps you may want to consider inclusion of one of those to bolster the cold mains supply, post stopcock.

Most if not every boiler manufacturer stated not to connect push fit within 800-1000mm of the boiler. So you get a free sprinkler system Not really a problem in a modern sealed system. Only a problem really if you go for a lesser known manufacturer. Copper is on its way out, so the market lead will end up plastic / other synthetic in the long run. Pipe clip centres need to be observed, but agree where on show, or where repeated light impacts may occur, copper is best. Lol. Agree 100%.

Just all the controls / valves etc need something ‘fixed’ and copper / brass offers that. Push-fit also tends to allow the pipe to rotate ( deadly with JG Speedfit as it can simply undo itself. I try to do all my plant rooms with copper and a mix of soldered and strategic compression joints, eg to allow a ‘spanner only’ removal of any and all valves etc, ( so no cutting and soldering to replace anything U/S is the end goal ). @PeterStarck’s install with JG remains a thing of beauty, but a labour of love.

Should be less than a days work if he brings a +1 to help with draining and refilling the system. My personal best is 3 hours on my own, with a bunch of students around me moaning that their monthly showers were overdue ?

In a one bathroom house it would be difficult to make it add up, and at that stage you’d consider not steering away from the vernacular. Manifolds can be cheap ( DIY ) with these or a few £ with Hep2o brass ones ( my weapon of choice ). Ultimately they’re not going to be turned off very often. Main advantages are maintaining pressure ( flow ) to multiple outlets simultaneously, but only a notable benefit if there are a at least a couple of bathrooms that you’d want to be showering in at the same time. How good your cold mains is and the max flow rate of the hot water device will dictate what can be delivered of course. If you’ve a combi, for eg, then little point in radial plumbing of course.

That quote is about right if it requires a new gas run ( upsize ) condensate connection etc, but is a bit pricey if it’s ‘one off-one on’ on existing pipework. Get 2 more quotes to give you a yardstick.

Once the uninterrupted Hep has traversed the entire build from A to B then there are joints to covert the Hep to copper / brass. It is accepted as you’d have the same connections if going from copper to brass, just this introduces just one more joint. You can get Hep to brass in a single fitting, so check out the full range at Hep (Link ) website to see what they offer to get you up and running. Hep also do flexi tap connectors to go from Hep to 1/2” and 3/4” taps in one item. For clarity, a lot of folk on here are installing radial plumbing runs to each outlet so no T connections are required ‘behind the scenes’. If you want to do series ( regular ) plumbing then you will likely end up with some additional joints.

Use a cheap ASHP to provide the bulk of your heating, with oversized radiators if UFH is a no-go. You can fortify this with an in-line electric boiler to boost the flow temps in December/ January and mothball it when not needed. Similar running costs to LPG when you compare holistically, and zero pita to install / own / service / maintain ( plus no dragging big bottles around ). If you have 150mm to play with, then an overlay system Link over 100mm of insulation may just get you through, but the more insulation the better of course. These retrofit UFH systems typically utilise a higher than preferable flow temperature, when using an ASHP, so a design heat calculation to work to will be paramount before being ‘advised’ any further.

You need to say what type of shower tray / wet room former is going in If it’s a pre-cast above floor tray it’s minimal effort, but you need to shutter out for a wet room type former etc. Impey and Diamond are a couple I’ve fitted, and only need 22-25mm installation depth. Stick to your guns, it’s a great idea and makes a room look a million dollars. He’s secretly enjoying

Yup. In the plant rooms / exposed areas ( like one of my previous installs above ) I always change to something solid, but behind the scenes I run Hep everywhere else. The benefit of not having hidden joints in the fabric of the dwelling is good enough reason for me to mix the disciplines accordingly.

As ( iirc ) the cabins will eventually need a rock solid internet connection / WiFi signal ( and possibly TV set top boxes ) I’d just extend the armoured BT cable and get subscribed connection(s) with stand alone router(s) ( c/w WiFi ) installed permanently at each of the cabins. If you do extend your BB connection to lend it to the cabins then your bandwidth will be gone when you try to ‘share’ the connection. You could probably service both cabins with a single subscription for the get - go ( multi-room option with 2x set top boxes ) and take a PoE WAP to the other cabin. Limit will be how much stuff can ‘be online’ at any one time so all depends on how good a service connection you get to start with.

Were these actuators done up hand tight, or with a grips? I recently fitted 9 and found they worked much better a little over hand tight, almost 'loose'. Just using the body of the actuator to turn a bit of extra tightness with the nut was enough to stop the actuator in its tracks.

Some do give good service, and some just want the sale.....

Silicone will do the same job if it's a very thin gap but it's not a bonding agent at all, just a sealant, so if it fails you can have expected nothing more from it. Silicone is a finish product, and has very little integrity vs a non-silicone product like CT1. Also, it attracts mould aka black death, so I very much like using it to create a top 'cosmetic layer' which can be easily removed and refreshed when the bathroom gets a freshen up / new lick of paint. 5 years is about right for silicone, after that it seems to start to show its age with any kind of regular manual / direct cleaning.

Sitting down from the upper moving rail of water, that is a very dead leg. As it's not true potable water, I think I'd want that gone.

If an open area has a stat in it, and the heating pipes to that zone traverse smaller enclosed rooms, then the likelihood is that the stat will call for heat way beyond the smaller rooms requisite for more het input, ergo that small room would overheat. That may help out a lot, vs timed heating. Don't think for one minute that slowing down a loop at the manifold ( balancing ) will give temperature control, it won't. You'd probably be down to 25mm flexible conduit as 9mm wall on 16mm pipes would give you 34mm total. You'd only really have to insulate the flows, and group them at the absolute perimeter of any room they traverse. You only need 30-40mm between pipes where they congregate. If the manifold is bought then yes. Just remember now is the time to get it right, not after it's too late. If it's new, they should accept returns. IMO, yes. An old plumbing saying is, "enough 180o bends is a dead end", and inverted layout offers only 90o bends. Serpentine also puts all the heat at one end of the room and all the cool return flow at the other, so flow and return need strategic planning by design. Not important in a thicker, heavily insulated slab, but it will be notable with thinner insulation and a wafer thin emitter. I install UFH for others, so I have to be sure it all works A1 every time, and I would never do serpentine. As far as serpentine being easier? Not imo, but I am a 'seasoned' installer....