Combi Boiler Fitted, Fed from old loft main?

H

Haradoo

New Member
A family member recently had a loft tank system replaced with a combi - old house. The pressure in her bathroom is now very poor, pressure in the kitchen is fine - it's a very small house so these rooms are 1 wall apart.
I noticed when fitting her kitchen there are multiple cold mains coming in to the house, and on tracing the cold feed for the combi it looks like the installers have just used the old cold feed coming down through the ceiling from the loft.
When she turns on the shower there is about a full minute's delay before any hot comes through, and the pressure is barely enough to be usable.
My question is, would re-routing the main feed to the boiler improve the pressure rather than the roundabout route the cold is taking at the moment?

Sorry for the long question..
 
What is the pressure and flow like on other hot taps in bathroom and kitchen ?
" Multiple cold mains coming into the house ".... Are you sure ,that would be odd !
 
pressure and flow in kitchen are good, there are two cold feeds coming in through the floor in the kitchen (different ends of the room)
 
Is the shower electric? Have you or more to the point your family member contacted the installer?
 
If the hot flow is good at other taps ,then the problem with the shower isn't related to the pressure of the hot water coming from the boiler.
What type of shower is it ?
 
Schooldays said:
Is the shower electric? Have you or more to the point your family member contacted the installer?
Click to expand...
No - an old mixer shower (concealed valve) with a (now decommissioned) stuart turner showermate pump under the bath
Installer is super unhelpful, they cut the flat roof for the flue and messed it up so I had to get the roofer back out to patch it up, since then, not keen on getting them back

terrymac said:
Is there a stopcock on both of them ?
Click to expand...
There's a stopcock (now working after I replaced the tap) on one of them, the other is just a pipe with a blank on it - there's also one pipe coming up from the concrete floor on the other end of the room which i'm now using as the feed for washer and dishwasher
 
If the feed to the shower is still going through the now defunct pump will that affect the flow/pressure? (Sorry, more questions)
 
Haradoo said:
If the feed to the shower is still going through the now defunct pump will that affect the flow/pressure? (Sorry, more questions)
Click to expand...
If the pressure was ok before it was decommissioned, then yes.
 
If you turn the stopcock off ,does that close off the flow from the other pipes that come through the floor ? If it does ,then that's not two supplies.
The pump should have been removed from the plumbing to negate any resistance to flow ,was it ?
 
It closes the flow of the pipes in the kitchen only, there's a gate/lever valve on the cold main in the boiler cupboard (the one that comes down from the ceiling)
The pump wasn't removed - the pipework still goes through it
 
If you want to isolate the cold mains to the entire property,where is the primary stopcock ,as what you describe sound like they are just isolation valves on branch pipes.
Removing the pump may cure the showers lack of flow , is the cold supply to shower good ,or the same as the hot ?
 
Haradoo said:
It closes the flow of the pipes in the kitchen only, there's a gate/lever valve on the cold main in the boiler cupboard (the one that comes down from the ceiling)
The pump wasn't removed - the pipework still goes through it
Click to expand...
Could be an issue with the gate valve
 
If the hot and cold are both routed through the pump ,remove it, but to be frank with both under mains pressure I wouldn't have expected the resistance to be enough to cause the symptoms you describe,and suspect the shower itself may be the root cause.
 
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