unvented

  1. P

    Should I add a prv after unvented cylinder?

    We had our boiler replaced and an unvented cylinder installed last at the end of last year. It has been a huge improvement over the previous gravity fed system with much more pressure from the taps/shower. The issue we have currently is when the shower/bath tap (SF product: 8293) hot side is...
  2. E

    Unvented Cylinder Set Up As Vented

    Hi everyone, I'm looking for some advice please... We had a heat pump installed about 10 years ago and with it a Joule twin tank setup. The bottom one is the buffer tank and the top one is an unvented hot water cylinder. However, the hot water cylinder was set up vented. This was working OK...
  3. S

    HOT WATER TANK INDENTIFICATION

    Good day, can anyone tell me what kind of system this is, just from the plumbing? Also, from its size, what the likely volume is. It must be about five foot six tall. My guess is an unvented combination tank. Many thanks in advance if you are about to assist and Merry Christmas to all
  4. J

    Plumber gone AWOL

    We're currently renovating our flat, and have had some plumbing work done, including having a new unvented electric cylinder installed. We're currently getting everything signed off by our BCO and need to get the certification for the boiler install. Trouble is that the plumber has gone AWOL and...
  5. 5

    The White Stuff!

    Hi, I'm hoping someone can identify this white stuff that blocked up my shower and tap to the point the water was a trickle coming out of it. The cold water side is clean, not a trace of it. The hot water comes from an Megaflo Unvented Cylinder. Any suggestions on what it is and how to...
  6. Funkgroover

    Unvented hot water tank disconnects the internet - yes really!

    I have Joule unvented hot water tank. It's about 5 years old and we've never had a problem with hot water or pressure, but... A couple of times a day, always when the central heating is on we hear a hissing sound. This lasts 3 - 5 seconds. I believe it is a release of pressure even though the...
  7. A

    Unvented System - very average shower

    Hi all, Read plenty of these but first post so bear with me! I've recently bought a house with an unvented system. Was pretty disappointed when we moved in that the shower was pretty average. Was wondering if there is anything that can be done to improve/ anything to check. Flow rate is about...
  8. D

    Unvented Cylinder Discharge

    Hello, I've got plumbers in to quote for installation of an upgraded electric hot water system. I have very low hot water pressure and the system is probably 20+ years old. It's an economy 7 immersion heater system. I've been told by one plumber I can get an unvented cylinder installed, with...
  9. I

    Shower with diverter for unvented system

    Hi , I was about to buy a Mira Honesty shower system but noticed on the installation instructions that it says a flow restrictor MAY need to be fitted when flow is greater than 0.5 bar. We have an unvented system and based on a test I did yesterday , we get 1.7 bar on one outlet (kitchen tap...
  10. R

    Replacing hot-water tank

    Hi, The house has this hot water tank, it's about 15 years old. It's always given us problems, the last one being a tidy sum of money spent on replacing a failed PCB about 2 years ago. I had an engineer over for a boiler service today, he had a look at the heating system in general and saw...
  11. J

    New home - trying to figure out complex heating system

    Hi all, Would really value any expert views as I am completely new to this. I recently purchased a home (recently refurbished by the previous owner) with a seemingly complex heating system. Please could I get views on how it works? Devices: Telford unvented horizonal cylinder Valliant Ecotec...
  12. E

    Unvented System

    Hello A small bit of back ground. Roadworks have been completed outside my house. In doing so they disturbed the mains water supply, which in turn has dumped a lot of rusty looking sludge into my water supply. This is now running clear, but i very poor water flow to most of my taps. The water...
  13. R

    Unvented cylinder - hot water issues

    have a unvented cylinder with system boiler. heating absolutely fine by itself when hot water is on with heating - heating suffers in 3 radiators (last ones) and hot water from taps is luke warm until i put a shower on for a few secs. any ideas where the issue lies. original plumber is not...
  14. B

    Which Mains booster pump

    Hello, As part of the whole house refurb I am having a unvented tank ( telford horizonal) system installed. The plumbers have told me to research mains pressure boosters in case the flow rate isnt enough for me. They are allowing for it to be easily added later. I have a 32mm pipe coming into...
  15. B

    Qualification to install a unvented tank

    Hello Would you need a particular qualification to install an unvented tank hot water system including boiler vessels etc etc. Is a gas safe person qualified enough?
  16. B

    Boiler and cylinder for new system

    Hello, As part of a my extension works we have underfloor heating to the ground floor and radiators on middle and loft floors. We have 4 bathrooms but there are only 3 of us in the house. The builder is recommending a telford sleeper tank (250l) and a vaillant 430 boiler, he says Telford...
  17. B

    Cylinder slow to refill

    can someone please help? We have had a 210 litre unvented indirect cylinder installed we bought it but unfortunately we couldn’t use it as intended as we couldn’t get the required 20 litres per minute. So we are using it primarily as a vessel, we have had a tank in the loft fitted too and are...
  18. M

    Megaflo - hot water feed not heating tank

    I'm not a plumber, and would really appreciate some guidance if possible. I have a large unvented Megaflo cylinder (Heatrae Sadia CL250HE) for our 3-floor, 3-bathroom house. Always been fine since installation around 10 years ago. However, now I'm getting no hot water unless I use the immersion...
  19. C

    improve pressure from unvented electric water heater?

    Hi folks, I have an Ariston Lux 15 litre 2kW electric water which I bought from Screwfix and to be honest I am very impressed with it, it's a great value piece of kit which totally fulfills my modest needs... The only thing I would like to improve is the pressure in my shower. The heater relies...
  20. G

    Return or flow? Advice much appreciated

    hi, looking for a bit of advice. Had a complete new system put in. Worcester greenstar with unvented cylinder. Been in use for 6 months over the winter. Never been short of DHW while the CH has been on morning/day/night. Have noticed that with the CH now hardly on that there is very little DHW...
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