Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 10 replies
  • Subscribers 32 subscribers
  • Views 807 views
  • Users 0 members are here
Options
You may also be interested in
This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

Potential Domestic Unvented Hot Water Cylinder Issue.

Zoomup
Mornin' All,


yesterday I visited a horse stable block in the middle of nowhere. One of the stalls has been converted into a "utility room" for caravaners. It contains a cheap dim L.E.D. ceiling light, a washing machine, a tumble drier and a small domestic unvented water heater for hot water, containing two 3kW heating elements, all run on a 4.0mm2 underground S.W.A. cable about 100 metres away in a house. But that is not the issue here.


The unvented cylinder has lots of copper pipework attached, all with no thermal insulation. Bearing in mind that this "room" is a very well ventilated horse stall outside, what are the main safety concerns regarding the unvented hot water system?


Thoughts please.


Z.

Parents
  • 0
    If the pipes freeze and the water in the cylinder cools, then when the heater is turned on the cylinder contents will expand, and with pipes blocked by ice where is the expansion to go ?

    Hopefully into the internal air gap or closely associated expansion vessel - expecting the supply pipework to take up expansion is a bit old hat these days - too easily defeated by by water meters (which usually prevent backflow) and risks of warmed water (with associated risk of bacterial growth) being supplied to cold drinking taps.


      - Andy.
Reply
  • 0
    If the pipes freeze and the water in the cylinder cools, then when the heater is turned on the cylinder contents will expand, and with pipes blocked by ice where is the expansion to go ?

    Hopefully into the internal air gap or closely associated expansion vessel - expecting the supply pipework to take up expansion is a bit old hat these days - too easily defeated by by water meters (which usually prevent backflow) and risks of warmed water (with associated risk of bacterial growth) being supplied to cold drinking taps.


      - Andy.
Children
No Data

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines