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About JIH

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    Scottish Highlands

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  1. Another DIY 'plumber'

    So if I use the coil side of a UVC for DHW preheat I am using the non-potable side?
  2. Another DIY 'plumber'

    Ok, you've given me some food for thought! Thanks for the Trevor tip I think I might try this from the other end, so to speak. I'm settled on using LPG to bring pre-heated water up to desired temperature for DHW. Therefore I will need a G3 plumber onboard to install it and do subsequent do annual inspections. I shall see if I can find one to quote for installation of water heater and possibly UCV and annual inspections. If I did decide to keep with the 'vented' option (as per my drawing my understanding) I understand that as long as I don't put in an immersion heater the system is considered to be "used solely for space heating" and the Danger from Heat guidance does not apply (Scottish Domestic Regs 4.9.0). Meanwhile I think I will get Newark to give me couple of quotes, one for a large coil and one for an external heat exchanger and see how it all adds up. Thanks again.
  3. Another DIY 'plumber'

    I was trying to keep it simple - just run the pipes out through the hole in the wall with the ASHP pipes. Construction: timber frame with 300mm pumped cellulose (MBC) but externally at this point clad with Knauf render board and rendered with K1. Reluctant to cut flue sized hole through render and board. I'm slowly learning. But what does the "iron" signify with a copper fitting? Is it to do with BSP parallel/tapered thread? I take I need "irons" for joining to these? But could possibly use these? Apologies for all the questions, but my head hurts Would you reckon one of these would do me for the thermal store? Would the supplied coil be suitable as I would not be using for the purpose it was designed? I will be taking heat out rather than putting it in. Or does the principle work fine vicky verky? Thanks.
  4. Another DIY 'plumber'

    Ok, understood. However I was going to use the 3/4" Hep2O valved manifold fittings at the DHW manifold. Ok to increase to 22 just before this? Rinnai outside as I've not allowed for flue in the build! Thanks
  5. Another DIY 'plumber'

    @Nickfromwales that depends on the height of TS. Option 1 - TS under half landing (tank <1100mm) distance to Rinnai = 2m in plan Option 2 - TS in utility room (tank >1100mm) distance to Rinnai ~ 1m in plan as heater on wall directly outside Distance from heater to DHW manifold ~ 2m in plan. Would much rather have tank under stairs if possible as utility room quite small. Go from 15mm to 22mm at the outlet of the Rinnai? Thanks.
  6. Another DIY 'plumber'

    Yes I am a wee bit reluctant to use my house as a test of my soldering skills. There is already enough to keep me awake at night... The Hep2O looks pretty fool proof and being de-mountable should make fitting to the space easier, I hope. I shall definitively beg/borrow/steal a pipe bender, and thank you @Nickfromwales for you offer of how to drive it! If the tails on the water heater are 1/2" and the DHW manifolds are 3/4" where should I make the reduction - at the heater or manifold for hot? At the tank or heater for "cold"? Thanks
  7. Another DIY 'plumber'

    Ummm. . . You make it sound so easy
  8. Another DIY 'plumber'

    So does anybody have any concerns regarding my proposed system as above? If not I'll get on and order lots of Hep2O fittings, copper pipe and maybe a bender... I was thinking of taking off a feed from the pre-heat before the LPG water heater to feed the 10mm DHW manifold. My thinking was that most of the time I could have warm water to WHB without the need to heat it up through the heater only to mix it down through the TMV. However if I required hotter water than that of the thermal store (for those wet shavers) then I could shut off this feed and go through the mixer. All input appreciated. Thanks
  9. Another DIY 'plumber'

    Or a passover according to @Onoff's reference guide: http://bpec.org.uk/wp-content/uploads/2016/01/BPEC-Essential-Plumbing-Skills-Copper-Pipefinal-version.pdf Perhaps it's similar to the dwang/noggin controversy and depends on your ancestry?
  10. Another DIY 'plumber'

    Thanks @Onoff, some useful stuff here for bending. Nice saddle/crossover/passover
  11. Another DIY 'plumber'

    Thanks @JanetE for the pics - very neat work! If you fancied a trip north. . . Did you increase the thickness of the wall behind the shower because of the plumbing? Which toilets did you 'plumb' for? I planning Duravit all round with the Stark 3 rimless toilet Dwangs up here!
  12. Another DIY 'plumber'

    Great idea - I shall have to investigate the pipe bender, thanks @Vijay. But I will steer clear of the solder cross-over as the idea is not to use solder joints at all (as I can't solder). Will have to try and take a leaf out of @Onoff's book and bend it over.
  13. Another DIY 'plumber'

    Yes indeed @JanetE I've had fun feeding all the runs through the joists especially as have a route constrained by steel beams and staircase. Do you think I need to pressure test all the runs before boarding up my ceiling @jamiehamy? I hadn't planned to as it would be quite difficult to wet test at this stage and I understand that air testing with Hep2O is a no no. Ok thanks @PeterW, no PTFE tape. I'm happy using Hep2O back from the taps to the manifolds. But do you think it would be best for me to use Hep2O fittings on copper for the rest of my plumbing? For instance using Hep2O fittings instead of solder to make up this (@jamiehamy's pic) And indeed on the heating side too, as per the diagram on my original post? Heating_DHW_Preheat.pdf Thanks
  14. After having had an eye watering quote for my plumbing I've decided to give it a shot myself. I will try and put into practice the advice I've read on this site and hopefully get some clarification on points I've not grasped... So I have almost finished the first fix having run most of my wastes to the stack. Also got all the HEP2O runs in for the radial plumbing system ready to feed the yet to be built HEP2O manifolds (10mm for WHBs and WCs, 15mm for rest), following in the footsteps of the Welsh 'master' @Nickfromwales, @jamiehamy et al I have 3 bathrooms and day to day DHW requirement is low but medium when visitors. Heating by 6kW ASHP to low temperature UFH, ground floor only. The system I have decided to go with is based on @JSHarris's model, but with a thermal store with mains pressure coil for DHW preheat going to external LPG gas water heater to top up the temperature. I know I will require a G3 plumber to fit the gas heater. I have no experience of plumbing and as I cannot solder my thinking is to use all compression fittings once away from the DHW & DCW HEP2O manifolds and for the heating side of things. Although with the amount of PTFE tape needed I might be better with HEP2O fittings! Might HEP2O fittings be more 'fool proof' than compression fittings? Here is my attempt at drawing the system up. I'm about to start ordering stuff so would really appreciate feedback, especially with regard to the 'thermal store'. That seems like a lot of antifreeze. Many thanks. Heating_DHW_Preheat.pdf
  15. EPS Protection

    Another one