gas burner pressure

[chappers]

My plumber has installed a new boiler for the customer whom I am doing a loft conversion for.
It is a combi in place of a gravity fed system and has been done to remove the tanks in the loft.
Now subsequently due to the fact that the mixer shower (ancient mira 88)is now running on mains cold there is not enough hot coming through to get both a reasonbly hot and powerful shower at the same time.
My plumber has now gone to spain for two weeks and before I start taking drastic remedial action myself would it be ok for me to turn up the gas burner pressure as a temporary fix until the whole bathroom gets ripped out in three weeks time, and a PRV or guvenor can be fitted, as i am supposed to be sorting the loft and don't have time to be arsing about with leaks "creating them that is"

 

[stulew]

I am not a plumber ( Just a CORGI Engineer) so I can't advise you on plumbing rectification but I can tell you that you are NOT allowed to touch the burner pressure unless you are qualified to do so (and that means having the relevent appliance on your CORGI card) so if I was in your shoes I would leave well alone.It would NOT solve your problem anyway. If the installer is a mate of yours I would try to keep your customer nicely "Buttered Up" until he returns then let him sort it out.Otherwise you will need a Registered Plumber....
Plumbers for Plumbing..... Roofers for Roofing... Sparks for Sparking and Loft Conversion Specialists for Loft Conversions.Not much help I know but you could unearth yourself all sorts of warranty problems etc.

 

[kevplumb]

are you sure that the shower will work on a combi

 

[chappers]

I was a bit wary so tomorrow I am going to have to get my plumbing tools out and sort the cold feed to the shower, have to do it as my customers are starting to stink

 

[PEDANTICVINDICTIVEMAN]

I have fitted combis on systems with old mira 88 mixers and got away with it apart from the spindle leaking a bit when being used, which doesn't matter as it is inside the shower area, cant see why yours wouldn't work unless it's down to a cheap combi.

 

[kevplumb]

cheers pedantic i couldnt remember if it would or not

 

[chappers]

The shower was already leaking from the spindle and does have a pretty furred up cartridge, the boiler is a decent one, an Ariston microgenus 27, the water pressure is very high there, will try a PRV on the cold feed to the shower tomorrow so hopefully that will sort it. The whole lots going to be ripped out in a few weeks anyway, once the lofts done and they've got a bathroom up there.

 

[corgiman]

The shower needs balancing,

 

[johnbrist]

Many years ago, when I had a combi fitted, the Mira 88 worked, but not really very well. So I swapped it for a Mira 415 which is specifically designed for use with combi boilers and the like. If I remember correctly, as the pressure dropped on one feed (say the cold) the valve would reduce the flow on the other feed. Anyway, the 415 was a direct replacement for the 88 (same pipe work) and was much, much better when used with a combi. (The 415 is still in production, though the spec might have changed.)

 

[chappers]

cheers people, will make sure they get one suitable for a combi when the bathroom gets re-done in a few weeks time.