Onoff

Thanks. Was just thinking less to drain down to add the cleaner from the header. As you say though, I'll need to drain down to fit the Magnaclean! I'll see if I can borrow a 28mm pipe slice from work. I'll do at the weekend. Kid less then so nobody but SWMBO to complain they're cold! I'm going to have to sort this one I think. When I've drained from here before it takes an age to drain, hardly comes out at all to start with. This isn't anyway the lowest drain on the CH system. Down to 4 different floor levels in the house since I did the bathroom! ? Looks like 1" and 2" spanners.

Who knew? I removed the covering board from the 28mm flow and return pipes to the boiler and there's a bloody great gap where I can see straight into the loft. Must be some heat loss up through there! Plan is to put the Magnaflow in the right hand pipe, return to the boiler. Can anyone see why I can't move the flow from one side top to the other? It's not quite in line though: I've been up above the dormer ceiling and though I can't look inside, I've measured the header tank as best as. I reckon there's about 20L of water in it. If I tie off the header tank ball cock then drain off say 30L of water via the boiler drain cock can I chuck my 2L of system cleaner into the header? Then I assume let refill then bleed the rads.

Seems I can get a grant for 2/3 for something... The intent is a manifold. There's a temp sensor run to the centre of the bathroom floor. Kindly sent to me by @PeterW many moons ago.

I must download it. Did my bathroom layout on AutoCAD:

@Nickfromwales, morning. Appreciate the tip ref the low loss header and that, size wise, would certainly allay SWMBOs fear over losing under the stairs storage space (for ever more crap). Assume I fit a manifold then with provision for at least 7 circuits, roughly: Bathroom loop Bathroom towel rail Study Kitchen Lounge* Diner* Bedroom NB: No loop in the hall or stairs room itself. (* Going to be one big room eventually, not sure if one loop is big enough). Would that "small" 25kW llh be big enough for all those loops? Maybe I'd be better now arguing for a bigger space for a bigger tank? Should I, as an exercise, calc the eventual runs of pipe now, before I venture too far. Similarly, I aim to EVENTUALLY do away completely with the downstairs single pipe system. If I then heed the sage advice given here over the years and fit a UVC or TS the obvious place for it is under the stairs. If there is a "tank" already there it's easier for me to sell the idea to her. One ideal I suppose is that whole under the stairs area gets given over to me for a mini plant room. An alternative perhaps is our plan for full height cupboards either side of and over the bathroom door entrance to house the stacks of tat! (You'll walk through a corridor in effect made up by the cupboard sides). Maybe one side of that gets given over to house a tank? PPPPPP! ?

I don't believe it.

As @PeterW says, on the return before the boiler! Pro_Installation.pdf

No worries, it can go in either pipe, whatever's best. I must admit I thought they were meant to stop crap getting into the pump and valves.

14mm mm masonry bit. Then switch to a 14mm Morse Cobalt hole saw (the best imo, piss all over Bosch) on a 300 mm extension bar. Use cutting paste too. Temaxol, RTD, Trefolex etc. https://www.uktools.com/av10-morse-master-cobalt-bi-metal-holesaw-14mm-916.html

Cheers. Just ordered from your link. Thinking to place it in the 28mm pipe coming up from the boiler. There's the flow and return pipes in that boxed in section behind the broom handles. Not sure though if the pipes are spaced off the wall enough. Probably not knowing my luck! I might as well swap the 28mm flow pipe from the top lhs to the right at the same time. That'll put the flow and return the same side of the boiler unless that's an issue? Makes it easier as I'd like to box the boiler in sometime.

Sods Law I did buy one and it'll turn up but I'll just grab one of these maybe? https://www.bes.co.uk/intaklean-2-magnetic-filter-28mm-22831/

Did I buy a mag filter already, that's the question? Been in the loft, nothing there. Remember going into a local plumbers merchant but did I come out with one? Going to make use of the search engine here as I reckon I'll have said if I did.

Try 50+ years for this single pipe system. Before oil here it was a wood burner. I replaced the hwc maybe 20 years back and the old one was nigh on half full of scale. Heavy was the word! That's why I'm so paranoid about keeping the old and and new separate.

Haven't got one at work. File and a small square, All good.

Thinking maybe to sling in a double dose of cleaner this week and let run round, then drain down and fix the boiler drain cock next weekend, at the same time put in an inhibitor. A good time to add in a Magnaclean I guess. At least it'll be cleaner. Got a couple of weeks off in Oct so I might aim to dig the floor up then. When are you coming to Kent again! I'll swap for a crate of Westerham Brewery's finest! ?

I took 10mm off one for a lad at work with a hacksaw and file not so long ago. Held in the vice wrapped in cloth. Came out spot on. And I thought they were taking the piss as an apprentice when they said we should be able to hacksaw to within 20 thou!

This? https://www.toolstation.com/1-14-sprung-basin-waste/p61797?

https://www.victorianplumbing.co.uk/bauhaus-unslotted-small-free-flow-basin-waste-bsw0270c?

Surges can kill delicate electronic thing like CH controls, fax machines (are they still a thing? ?), PCs. Not worth the risk of not unplugging.

Ahem...erm...never, ever run a cleaner through it, no inhibitor in it and no, no Magnaclean fitted though I've looked at doing so a few times. Worried tbh that it might open up loads of little leaks in the old system. (I've bought cleaner before and it's now so old the label has worn off the container ?). I've this half thought I might have actually bought a 28mm magnetic filter to go in but forgotten where it is... I need to drain down sometime really as I've a long term weep on the side of the boiler from the drain cock: I'm not sure tbh. Struggling to understand whether it would ever need to. I must be particularly thick today! Surely for the low loss header to be getting heat from the single pipe system then the downstairs CH must be running? I'd only then surely want to ONLY heat the bathroom IF the downstairs CH is running or I'd be running potentially "cold" through my slab and undoing all the work in heating it up. That low loss header looks good size wise. So in there is a heat exchanger? Is it a sealed system? How does it deal with expansion on the separated side? Cheers

This is MY temporary! ? The downstairs CH is the old 3/4" nominal bore copper pipe that runs round at skirting level. It used to feed the downstairs bathroom but I bypassed that with the pipe that runs under the aforementioned blue carpet tiles above. It then runs up, under the suspended floor, in copper (in case of ?) to the small wc: Then the single pipe continues left through the wall of the WC to the bedroom. I do have an indirect hwc I bought on eBay/Gumtree with this project in mind. I think they took it out only as they had a combi. Space is the thing though. I'm looking for the smallest, practical buffer tank. As below the stairs room is pretty much dead centre of the house as shown on the (unfinished ?) drawing below. Easy to take UFH pipes off to the other rooms. The "triangle" at the bottom of the pic below is the boiler room. Boiler is at the other end of that room. Back earlier in this thread I'd had the idea to feed the hwc/buffer coil with the old "dirty" single pipe system then use the volume of water in the tank for the UFH, I guess to feed the manifold / pump and the various loops, just the pump shown here. The "problem" was I believe the need for a header tank if an open system. Apologies resurrecting stuff that's been discussed before! Any and all suggestions gratefully received.

Time to resurrect this and FINALLY get some heat in the bathroom. Discussing with SWMBO and got our mojo back hopefully to take on projects (bereavement etc). Plan then is to clear the "stairs room", that is central to the house, dig up the floor and build back up with insulation (like I did with the bathroom). Laddo back to uni so his delicate gaming rig is out of the way so I can't be moaned at for covering that in dust! Digging up and barrowing is then then 12/15' straight run out the front door. To recap, plan is a manifold bolted to the wall under the stairs. One loop to the bathroom, another to the towel rail in there. Then I'll take loops off to all the other rooms in the house. I "love" this shot from my clean modern bathroom out into the rest of the bomb site house! ? Mind, that was always the plan to retreat to somewhere warm and comfortable. If I can now get it warm! Under this strip of blue carpet tiles runs my single pipe 22mm CH pipe. First question, bfo oil boiler, what size buffer tank to I need to serve the UFH? Intend to feed this buffer from the single pipe under the floor. SWMBO concerned about losing storage space under the stairs. Cheers (Hoarders, us? ?).

Might be some Salus/Heatmiser info here:

Weber Five Star Grout we use at work for packing clearance holes through structural slabs.

Says the self confessed, dab hand with a Dremel!