Search results

  1. vulcancontinental

    New Combi or Unvented Cylinder

    I can't advise I'm afraid, water is so changeable or used to be, there's more of a grid now. I found in north east Herts I'd lose the bubble, several miles west it didn't happen, the water came from an artisean well in a different area. I think I'd look at Oso and I hear people recommending...
  2. vulcancontinental

    New Combi or Unvented Cylinder

    I don't know what part of the country you're in but in some areas the water will absorb the air forming the expansion space 2 or 3 times a year in spite of the baffle. (I'm in Beds/Herts area). This means recharging it and sometimes the temp/pressure relief valve will need maintenance. Download...
  3. vulcancontinental

    New Combi or Unvented Cylinder

    That's valid and you bring up a good point; I got my unvented ticket in I think 1992, I have it at home. About that time I wondered about swapping for an unvented cylinder, there were no issues, I just pondered because I had my new ticket but I couldn't ignore the fact that I hadn't had a...
  4. vulcancontinental

    New Combi or Unvented Cylinder

    Fortunately I've been able to avoid every single one of the negatives in the first paragraph (pipes in a loft is not a negative) and have all the positives in the second with absolute zero maintenance for 40 years, 35 living there myself and 5 now with my son living there. I dont know anything...
  5. vulcancontinental

    New Combi or Unvented Cylinder

    Unvented cylinder: Pressure reducing valve, pressure relief valve, temperature and pressure relief valve, high temp cut off motorised valve, strainer, expansion vessel or air gap. Versus Vented cylinder: Ball valve in cold water storage cistern (and gravity but if that fails you'll have other...
  6. vulcancontinental

    New Combi or Unvented Cylinder

    Whats the cold main flow rate and pressure is the first question. There's no reason a combi couldn't be fitted initially then used later to supply DHW and heating plus reheat for an unvented cylinder in the future.
  7. vulcancontinental

    Underfloor heating leaking dirty water round manifold

    Search Continal Underfloor and look for the webinars, they used to be available to view again. They did an interesting one on manifolds with a coupe of points I thought worth bearing in mind.
  8. vulcancontinental

    How does the DHW supply in a normal house work?

    I'm simply intrigued as to where this normal house might be, do you have an address?
  9. vulcancontinental

    Boiler pressure drop of 0.1bar in 2months

    If you're paying for BG homecare repairs are prepaid, not free. Are you saying the system is 0.8 or 0.9 when cold and 1.8 when on?
  10. vulcancontinental

    Trying to get my head round return flow temp, delta t, BTUs... help!

    Bit crude but throttle the lockshield valves on the radiators down. Start at off then open a quarter turn those nearest the boiler and no more that one turn for those far away. 3 degree Δdelta T is certainly not optimal, slow the circulation down to get wider ΔT as possible. Don't know your...
  11. vulcancontinental

    Preparation in case of boiler / smart thermostat failure?

    Do you mean TRV not SRV? If you're thinking about getting a spare Tado in readiness and you then need someone to commission it, instead, and cheaper, why not just link out the switched connection in the boiler control box - a bit of wire, cost, nothing. OpenTherm defaults to running if...
  12. vulcancontinental

    If replacing a boiler, what would you fit?

    Building Research Establishment did a comparison years ago which found system boilers slightly more efficient than combination boilers as a standalone appliance but the losses between the boiler and cylinder negated the advantage, sometimes swaying it in the other direction. 40kW is high...
  13. vulcancontinental

    Pipe sizes and new boiler

    Yes, that's for sure but he's possibly been caught out already with someone he suspects is a cowboy plumber. Solution? Ask, with minimal information, for advice in a group that might or might not be populated with competent people and he can't even look into our eyes or watch body language to...
  14. vulcancontinental

    Pipe sizes and new boiler

    Large singles, medium doubles, bathroom radiator. When did we start using vague adjectives rather than actual kW's, residual pump head, velocity and ∆T to decide on pipe sizes?
  15. vulcancontinental

    Understanding short cycling & UVC water temperatures?

    Not sure what your heating engineer is getting at. The position of the cylinder close to the boiler is a good thing but it's the distance of the shower rose below the CWS cistern that's important for the shower (and pipe sizing)
  16. vulcancontinental

    Understanding short cycling & UVC water temperatures?

    Cylinders can be purchased with high or fast recovery coils minimising reheat. Also double coils for solar later and run in series from the boiler until then. As for recovery from showers that depend on how long it lasts and the flow rate through the shower you want; is it a deluge or just get...
  17. vulcancontinental

    Understanding short cycling & UVC water temperatures?

    1: The latter. Houses lose heat slowly so reheat the cylinder quickly and prolong cooler running for space heating at lower, more efficient temperatures matching reduced space heating load. 2: Depends on the control but yes. The EPH does either but I'm sure there will be others. 3: Good but the...
  18. vulcancontinental

    Understanding short cycling & UVC water temperatures?

    I was thinking of hybrid systems where depending on the boiler it can control the heat pump from the boiler control, gas still being cheaper than electricity.
  19. vulcancontinental

    Understanding short cycling & UVC water temperatures?

    With most Vokera boilers there is a Legionella program
Top