Low water pressure

[AssuredHeating]

Hi Guy's

A little advice please.

Currently at a clients property she has an old floor standing conv boiler with large indirect cylinder, open vent setup, a big shower pump that feeds 3 showers.

She wants the cylinder removed to make a bedroom bigger and a combi installed. she only has 15lt/m cold water pressure. balls.

The options I'm thinking:-

Fit a 42cdi combi, leave the tank in the loft, with a feed coming down to a single inlet pump, to pump 17lt/m of cold into the boiler to give the maximum hot water flow possible.

Fit an unvented cylinder then again keep the cold storage tank so I can pump cold water at a very high pressure into the unvented cylinder.

Not sure if the regs fancy any of these installations, but I have seen both in the past.

 

[Ray Stafford]

Hi Guy's

A little advice please.

Currently at a clients property she has an old floor standing conv boiler with large indirect cylinder, open vent setup, a big shower pump that feeds 3 showers.

She wants the cylinder removed to make a bedroom bigger and a combi installed. she only has 15lt/m cold water pressure. balls.

The options I'm thinking:-

Fit a 42cdi combi, leave the tank in the loft, with a feed coming down to a single inlet pump, to pump 17lt/m of cold into the boiler to give the maximum hot water flow possible.

Fit an unvented cylinder then again keep the cold storage tank so I can pump cold water at a very high pressure into the unvented cylinder.

Not sure if the regs fancy any of these installations, but I have seen both in the past.

If your customer wants to keep all three of those showers working, and assuming that there is no practical way of boosting the cold water main, then the best system is probably the one she has at the moment.

Out of interest, what is the pressure like ? 15ltrs/min is the flow rate.

 

[AssuredHeating]

I didn't test the pressure, but its only a 15mm main coming in, so I cant increase the size without digging up the floor.
I do agree with you, the best system is the current one.

 

[albatross]

What you have described is possible and safe but odd.
What is standing pressure like? How about an accumulator with a 42cdi or unvented with a mains booster?

 

[Whyme]

all depends how much money she wants to throw at it. ya can fit an unvented and pump it via a tank (similar but smaller to large tanks and pump sets) but will need to be significantly up sized because you'll want to supply showers etc apart from basin cold and sink perhaps via the tank for equal pressure etc. btw mains booster pumps are usually only allowed 12ltr per minute unless you get permission.