Plumberpro : Hi . I will try to help . When the unvented system was put in , do you know if the mains water pipe into the property was changed?
Unvented system put in 2 months ago. No change made to mains water pipe.
Unvented system put in 2 months ago. No change made to mains water pipe
Plumberpro : The unvented systems are great but rely on a good flow rate and pressure from the incoming mains supply.
Plumberpro : It may be that your mains supply pipe needs to be upgraded. Can you tell me what your mains cold to the kitchen tap is like ?
Plumberpro : The pressure and flow rate should have been tested before installation to determine if a new supply pipe was needed.
Generally the pressure is good. The kitchen tap has excellent pressure direct from mains. It is only the bathrooms that are the problem.
Plumberpro : Hi.. Can I just check that you have an unvented cylinder installed
Plumberpro : Ok. The thing to realise is that pressure and flow rate are very different. If you can imagine having two pipe sizes, one a metre wide the other a hairs width. These could both have the same pressure , but completely different flow rates, in volume terms.
Plumberpro : If your mains supply is too small , you won't be able to get the volume in that you need to run the whole house at the same time .
Plumberpro : Does that make sense?
Plumberpro : Also , do you know if your mains pipe is lead?
Plumberpro : I am sorry to inform you that whoever said an unvented system would give good pressure under any situation was wrong. It needs a good incoming mains supply.
Plumberpro : There are two ways to go about this
Looks like inlet pipe is lead- all other pipes are copper. i understand your point about flow and pressure. only other thing suggested by a friend was that header tank could be pressured more
looks like inlet pipe is lead- all other pipes are copper. Not getting much help from installer of unvented system
Plumberpro : With an unvented system , tanks are not used or needed. In your previous system you would have had cold water storage tanks that could have trickle filled up , ready for when the water was required and then pumped..
Plumberpro : With the unvented , your mains comes in and feeds off to all the cold outlets then branches to your unvented cylinder which is heated by electric or a boiler then on to hot taps.
Plumberpro : The fact the it is a lead mains pipe shows it is quite old and only sized for a tank fed system.
inlet pipe looks like lead- all other pipes are copper. Not getting much help from installer but friend suggested header tank could be pressured more. is that a possibilty?
Plumberpro : An installer has to be qualified to install these systems and should have known this. I would check he is qualified .if not you will have to get someone who is to check it's been installed right.
Plumberpro : Your only options now are to get a new mains pipe put in ( get a few quotes) or to put a booster in
Thanks for your advice. Will do both , get system checked and have new mains pipe put in