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  1. Sparkgap

    Copper fittings

    Is this still going? The website's gone and according to my search the company's dissolved.
  2. Sparkgap

    Replacing some gas piping with 28mm pipe

    It's called CYA! :wink5: I've got a £300k project at the moment to replace underground heating and water pipework in a school with new pipework running over the roofs. Our quote is liberally sprinkled with caveats as short of digging up the floors or smashing out wall panels we don't know...
  3. Sparkgap

    Ground source heat pumps

    Over the years I've seen some renewable installations which worked pretty well and many others which were completely pants. Some retrofit jobs should never have been taken off the drawing board and end up costing a sight more to run and install than equivalent oil/lpg. I've also found not all...
  4. Sparkgap

    Why twin oil boilers in church central heating

    Two smaller boilers will give greater turndown as well as redundancy if that's important. Most of the year I'd expect you could happily run on one of the smaller boilers at better efficiency than a single larger one. Servicing will be more though as there are two boilers plus finding routes for...
  5. Sparkgap

    Replacing some gas piping with 28mm pipe

    No probs provided the pipe is in a ventilated space. Looking at some flats at the moment with the gas pipes rising on the outside and internals done in tracpipe through the floor.
  6. Sparkgap

    Replacing some gas piping with 28mm pipe

    Quite agree. I did say straight pipe as I don't know the details of the pipe route. I would be inclined to put in a larger pipe but if it's the hassle the OP says it might be worth waiting to see if the boiler works on the original pipe, bearing in mind the existing one did. Other option would...
  7. Sparkgap

    Not all Radiators getting hot !!

    I take it you mean Magna1 32-80?
  8. Sparkgap

    HALL of SHAME PHOTo`s

    Had plenty of ballofix-type valves leak with water let alone gas. I'd use a proper lever gas valve anyday.
  9. Sparkgap

    Low Loss Header Opinons

    Low loss headers are used to hydraulically separate the boilers from the system, saves hassle with varying flow rates through boilers as valves shut down. For your boiler ratings something like the Spirocross AX125 would be suitable (assuming 80/60C) which also gives air/dirt separation. For...
  10. Sparkgap

    Room thermostat and trvs

    I'd suggest just using the room stat as a high limit and have the temps controlled by TRVs.
  11. Sparkgap

    Suggestions for heat guards please

    We always put the wire mesh type guards in schools when we fitted Drus or any hot case heater. Didn't bother with Vulcana fan jobs as they were cooler. Pity, looks a nice bit of wood and matched to seating either side. reckon you'll have to move further out or cover the inner surface with...
  12. Sparkgap

    Replacing some gas piping with 28mm pipe

    *gets out *** packet* 32kW boiler, about 3.5 cu.m/h so about 0.97 l/s for 22mm copper drops about 6.2Pa/m so about 136Pa total for 22m straight run or 1.36 mB which is a tad higher than recommended. 28mm copper drops about 2Pa/m so 44Pa/0.44mB which is okay. That's not to say the boiler won't...
  13. Sparkgap

    absolutely no clue

    What he said. Warmup also do a pretty thin system Total-16 Hydronic Underfloor Heating System by Warmup | Warmup You also need to remember that UFH output depends to some extent on floor covering. Roughly 70-100W/sq.m means it might not be suitable for older properties or rooms with large heat...
  14. Sparkgap

    Boiler switching off - cross leak??

    Just had a look through the users instructions and it only mentions a lockout for the red LED. When was it last serviced? If it's started getting worse could be either something external (low gas pressure or a number of things) or possibly something inside the boiler starting to give up the...
  15. Sparkgap

    Boiler switching off - cross leak??

    I take it's a combi. What make/model and is there an error code? If there's a 'cross leak' from cold to hot on the shower I'd think it would happen either all the time or just when you used the shower, not when ordinary cold taps are opened. Could it be turning on cold water drops the cold...
  16. Sparkgap

    Not all Radiators getting hot !!

    I would recommend the low loss header simply to separate the boilers from the system and get away from the boiler flow being affected by TRVs or things being turned off. You could go for a combined header with air/dirt separator such as the Spirocross or others. Then get a pump sized to suit the...
  17. Sparkgap

    New Boiler - Maximum Temperature Issue?

    I suspect the Ferrolli was running at 82/71 so a mean temp of 76.5C. At the moment you're getting a mean temp of 70C so rads probably giving about 85% of normal output (a lot would depend on how the system and rads were sized and whether they stuck 10-15% extra on. Assuming this was with outside...
  18. Sparkgap

    Not all Radiators getting hot !!

    Normally for large domestic/small commercial systems with multiple boilers I would hydraulically separate the boilers, so have the two boilers into a low loss header with their own pumpset and a separate pump to supply the UFH and rads. That way you keep the flows through the boilers constant...
  19. Sparkgap

    New Boiler - Maximum Temperature Issue?

    Probably not your boiler. If it's giving 70C that should pretty well cover it (most old systems were designed for 82/71C so mean temp of about 75C). Have you checked to see what the return temp is at the boiler when it's giving 70/75 out? What about the location of the Hive sensor? Could it be...
  20. Sparkgap

    Freezing 3yr old son's bedroom HELP!

    1kW should be okay on 10mm. Wondered if there might have been a problem with the pump not being man enough for the job but the change between 10 and 15mm in terms of pressure drop isn't a lot and if it's 22mm up to the manifold should be plenty. Just a thought, if you can get at the return...

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