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oranjeboom last won the day on July 22 2016

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  1. That's interesting since that's who I used to get my two heaters from as well. Perhaps they have more than one supplier (the elements themselves are from Tesla). One heater allowed me to 'drop' the pipe all the way down into the cylinder and with the other it hit the element (which i had assumed was the stop depth until I realised what was going on). Anyway, something to watch out for when fitting these - if your copper starts to glow nice and red.....
  2. +'s and -'s for the positioning. I always seem to have plenty of air in my plumbing so wanted to avoid that air pocket at the top. I did also notice that when having the willis 'the right way up' is that copper pipe will slide very nice into the heater at the top....and way down into the chamber itself touching the actual heating element inside. Probably not what you want! Also possible to drop and lose your copper pipe in the chamber - bit of a pig if you've just plumbed in the return pipes at the bottom. Perhaps other willis-type heaters have some sort of retainer to prevent you from over-insertion of the pipes! Reminds me of searching for 'willis heaters' on ebay...don't think it quite understood what kind of heater I was in need of...
  3. Looks neat as always @Nickfromwales !! Yes, that's what the instructions (posted above in blog) seem to state also. But perhaps Nick's setup won't have any air in his plumbing at all! 😁 My setup so far means I am relying on the manifold pump to circulate the water through the heaters too. They're only a short distance from the manifold on the adjacent wall: Still need to figure out how to connect the pipework to manifold. Was even thinking of using 19mm bore flexi connectors as this is just a short term solution after all. Not shown, but will have a 15mm pipe going up (see spare 22x22x15 on return flow) to the expansion vessel. Still loose fitted by the way so hence the dropped pipework in places!
  4. Pls let us know how that goes as these units have come up a few times in discussions on here. Only 1yr parts warranty on these I see! At least all inverter driven now. https://coolenergyshop.com/products/cool-energy-inverter-6-18-7kw-stainless-heat-pump-ce-ih6-18
  5. My heat loss figures are greater than most on here, so figured out I would need 2 heaters. They're likely only going to be short-term (but have now plumbed them in with a long-term backup solution) with the view that I will be using an ASHP for my UFH if I can source a cheap (possibly non-MCS installed) one. But it'll be interesting to see how the house performs when I start heating it. Suspect too costly and ASHP will be favoured. So as with most things @Triassic, it would depend on your heat loss figures and setup. You could run them during E7 hrs so that you have heat in the slab in the morning and depending what heat loss you have, that could last a while b4 heat is called for again.
  6. Be interested in knowing which model you're looking at. Presume you're self installing? Looking to potentially do the same as fed up with the RHI-premium installers slap on which simply don't stack up. Were these ASHP's amongst the units they are testing?
  7. Cracking on and just loose fitted most bits now, but with the manifold being slightly lower than the top of the willis heaters I could get air trapped in the top pipework (above the heaters). So was thinking to add an automatic air vent like so. Would the experts on here concur? TIA !
  8. Yes, was seeing whether it could be done on their side as was hoping to use space in the already limited cupboard for other items. But will have them assembled vertically then. Just had the postman deliver them this morning and the instructions imply the same. Will post them up in the blog for others. Yes, if this was a permanent heating source, then I would have it in copper too. But most likely now will probably adopt a cheap ASHP in the summer so I only really seeing this being in use until April. It will need to have a few bends in there also, so plastic would help. Would save a bit of time too. Any major issues with part 15mm copper part 22mm plastic then? Just a couple of bends.
  9. Thanks for the offer Jeremy, but I only ordered one 30mins before you'd posted this!! Another item for the MarketPlace? More questions: Next question - I've placed the expansion vessel about 3.2m from the return leg where it splits off by the willis heaters (out of the way, yet serviceable). I couldn't find any recommended distances, so presume this distance is okay? 22mm plastic (Hep2o) - found some spare, so was going to use this between the manifold and the willis heaters (which are 15mm): MANIFOLD (1") --> 22MM PLASTIC --> 15MM WILLIS ----> 22MM PLASTIC --> MANIFOLD (1") Any issues with flow rates? I'll have some copper on the inlet/outlet sides also.
  10. Thanks! Not sure why I didn't find any earlier as there are a few on ebay (dubious quality perhaps, but bought an Italian-made one). Guess there's not enough demand to buy them from TS/SF. Next question - is there a max distance I can have the expansion vessel from the return leg? I'd like to have it out of the way (yet serviceable). Probably 4m from the return leg (where it splits off by the willis pumps).
  11. Ok, so pressure relief vessel kit came with 3bar pressure relief valve. What pressure valve should I be looking at and where to source one from. The ones at Screwfix etc all seem to be fixed at 3bar. Currently have this one: https://www.altecnic.co.uk/images/products/info/313_314 Safety Relief_DS_07_11.pdf They do have a 2.5 bar also, but is that going to make much of a difference? https://www.altecnic.co.uk/domestic/plumbing-heating/sealed-systems/616/
  12. 👍 Yup, I thought that was the case and had two on my shopping list above already. Will add it to the diagram for future refernce/readers! Thanks J!
  13. Updated setup. Others have the Willis with element at top, but I may 'lay' mine down to prevent air being blocked in top. Will see what the instructions say, if anything. Internet a bit scant on instructions so will post on here when I get the goods. Also added bottle vent to manifold and NRV on mains fill line. Apologies for the small print.
  14. So, just putting my final shopping list together: Expansion vessel Can't find 15L, so oversizing it won't matter I assume? i.e. 18L expansion vessel (with loop and fixing kit). Pressure relief valve Only need the one correct, and that comes with the above expansion vessel kit? Bottle vent (fix to manifold) Yes, kept on having to release air during initial loop fill up (pressurising for concrete pour), but was thinking to add a bottle vent to the manifold so that any air is released automatically. Manifold is not pressurised at the moment so will have to do that. 20A DP switch outlet (for each willis) from a 16A MCB (like this one) . Probably one for each willis Immersion timer (like this one) to be added possibly when I change over to E7 low tarriff rates 15mm copper pipe - Willis heater connections are both 15mm, so seems best to just connect it all with 15mm pipe, unless there's a reason not to? Willis Heater - purchased