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  1. Sparkgap

    Unvented cylinder size

    Like this. Both cold feed and vent on the flow pipe off the boiler.
  2. Sparkgap

    Help with setting Grundfos pumps.Single Pipe CH heating system.

    What he said. Looks like 15mm copper conns? YUK! Don't know how your system is arranged but sometimes it's easier to run a new pipe from the return end and repipe the whole thing as reverse return, especially if the flow and return drop under the floor. Armstrong diverter tees used to be the...
  3. Sparkgap

    What's better than one pump?

    Went to a small hotel we put new boilers and cylinder in last year as they were complaining about no hot water and heating on the top floor. I should add that's all we did as I thought the existing systems needed total ripping out and starting again but they didn't want to spend the money. Hot...
  4. Sparkgap

    Unvented cylinder size

    You are assuming the feed and vent are connected either side of the boiler? I'd have the feed and vent both on the suction side of the pump on a low head system, no pumping over and only consideration is enough head to prevent cavitation.
  5. Sparkgap

    Length of gas pipe from meter to boiler

    I get 1.65mB drop plus fittings for 30m in 28mm! Certainly suggest 35mm pipe or larger.
  6. Sparkgap

    Possible reverse circulation

    I wonder if you've got some rads which have return connections into the main between the cylinder or towel rail and the boiler? It could be return flow from the cylinder or towel rail circulating up one return connection to a rad then through the rest before rejoining the main return further down.
  7. Sparkgap

    Dt30 or Dt25 Rad design

    Can I suggest if you are going for a new boiler you get one with a weather compensation option? If radiator size is an issue you could design your system for say dT40 and run at 70/50. This would not only mean the boiler is condensing most of the time anyway but the radiator size would be...
  8. Sparkgap

    No fill loop, ideas on where to find one?

    Depends if it's a system boiler or not. Probably an F&E tank in the roof and ballvalve stuck, or as I've recently seen in one place, F&E tank removed and fill loop installed in same place in attic!
  9. Sparkgap

    Dt30 or Dt25 Rad design

    Depends on how much space you've got for rads. at dT25 your rads will have to have 2.5 times the manufacturers nominal (dT50) output and for dT30 it will be about 1.9 times to achieve the required heat input to the room.
  10. Sparkgap

    Am I being dumb or is this a thing?

    Think on it: you have 28kW which should be plenty for heating a medium/large house. However when heating an incoming water supply you need a lot more: assuming heating from 10C to 43C 28kW will give you about 0.2 litres/sec. A domestic bath is normally assumed to be about 0.4 l/s so no chance of...
  11. Sparkgap

    Bulb Energy in Special Administration

    When my deal with Outfoxthemarket came to an end I had a good look around as I don't use a lot of elec/gas. Signed a fixed term with Eon which still has about 5 months to go and was cheaper than the new OTF deal I was offered, and glad I did! We'll see what happens next year.
  12. Sparkgap

    Air source heat pumps in the news again

    Caveat Emptor!!! A few years ago I had a commercial installation at a community centre. UFH, ASHP, total heat losses for the building about 70kW. ASHP manufacturer quoted for a unit, sparkies checked loading for new substation transformer which was being replaced with another which was already...
  13. Sparkgap

    Noisy Radiators! Please help!

    Does the noise vary depending on how many TRVs are open? Your pump is probably on full speed and depending on the size of your system you could get away with a lower speed but the combi may require full speed for hot water production. Give it a try and turn down one speed to see if it makes a...
  14. Sparkgap

    Fastflo water heater reliability?

    Some 6 years ago I replaced an old Andrews R2000 series water heater at a local factory with 3 Fastflo water heaters and additional storage (about 1500 litres total). Since then we have had a number of performance issues with the heaters, one has been replaced totally and another has had new...
  15. Sparkgap

    UFH BUFFER TANK SELECTION (no rads)

    I take it you have a mixing manifold with its own pump? Surprised at 50C flow as I would think this was a bit high for UFH but I am assuming this is required minimum flow temp into the manifold setup. I think your problem is with the small amount of water in the system: by fitting a buffer tank...
  16. Sparkgap

    Is 18mm plywood enough for loft tank support base, & what type of ply?

    Ideally marine ply. Weight of tank is one thing but also allow for weight of bod fitting it/changing ballvalve etc on the joists! From the description with the wall 500mm away (what about the other direction?) you'll be okay for support.
  17. Sparkgap

    Central heating pump sizing

    Basically between the boiler flow and return. I usually put them at least a couple metres away if possible but before any zone valves or controls. An AVDO or similar valve will start opening as the TRVs close and maintain the boiler flow rate. Also since there will not be more water forced...
  18. Sparkgap

    Central heating pump sizing

    Modern self regulating pumps should modulate down as TRVs close but may not keep up the minimum flow required for the boiler. Two ways: (1) fit an auto bypass valve to the heating to keep minimum flow through the boiler or (2) fit a separate pump for the heating and hydraulically separate the...
  19. Sparkgap

    Someone got to start this one 🤔

    Got furloughed for three weeks (all those outstanding jobs at home got done!!! -well, mostly :) ) now been back at work for a month: despite the lockdown we've still got tons of enquiries coming in, the estimators ae working from home trying to look after their kids and turn out a zillion...
  20. Sparkgap

    Dream Air to Water Heat Pumps

    Always a bit wary about ASHP performance in cold weather as most are tabled at 7C. Had a commercial installation with 70kW of load however when I queried the performance at design conditions (-4C outside) the manufacturer bumped their ASHP unit up to 100kW which screwed up the spare capacity...

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