Advice needed. Issues with underfloor heating and hot water system for new build

[Ermintrude]

Can I come and fix it for u? I'm reasonable and will get it working 100%

Not cheap not by a long way one 3k plus materials

 

[mark_mc]

we are all hitting are head against a brick wall, as we can all agree the install is undersized and that we would all have done it another way.
its now at the point it seems that the poor plumber that put it know that to.
its undersized a large cylinder requires independent 28mm flow and return in most cases.

 

[Gray0689]

Will have to test tomorrow and get back to you

Tell you plumber you make you out a sketch of the pipe work then we will be able to get a better look
Who specced the job for that kind of size I'd like to think there was a me consultation in design

 

[Ermintrude]

Tell you plumber you make you out a sketch of the pipe work then we will be able to get a better look
Who specced the job for that kind of size I'd like to think there was a me consultation in design

Nope but his mate knows all about boilers n stuff

 

[Nostrum]

Guys, look at the picture, this isn't undersized, its 35mm and 28mm. The picture is deceiving but it is larger Pipework than you think.

 

[Nostrum]

Carrera, the flow to hot water cylinder valve tees off the main run as it were, then before it gets to the hot water zone valve it tees off again, what's that for?

this is a Pipework issue, I'm sure of it, somewhere in that plant room, maybe with a combination of balancing chucked in as well.

 

[mark_mc]

NOT WORKING

undersized / designed wrong / needed re-done/

 

[Nostrum]

NOT WORKING

undersized / designed wrong / needed re-done/

very helpful. If it were undersized Pipework the cylinder would be robbing all the heat as the resistance to UFH would be too high.

 

[Nostrum]

And putting the smaller pump back in and it still working the same as it was is proof of that.

 

[mark_mc]

Its getting to ufh circuits but i bet its getting there great.
look at the resistance str after the pump you have the t's for the cylinder and which way would the water rather go-- to the ufh
and then you have the t's of to the flow return to the basement ufh manifold
to much resistance - no thinking in what way the water would behave
if you where honest looking at that pic you would never install it that way, its just wrong.
if it was pumped independently everything would work



i always price so that it works with zero defects and that comes with a extra cost.