How-to.increase low hot water pressure?

[Gary111]

I have an old back boiler with the rank and cylinder in one of the bedrooms.
The bath mixer shower tap won't stay on with just the hot water and seems to reduce pressure when you turn the cold on.
I'm wondering if it may need s backflow arrestor on the hot side?
Or is there anything else I can do to increase the pressure like fitting a pump?

 

[Exedon]

Pump is the way to go are you looking to improve flow on hot to whole house or just bath tap?

 

[Gary111]

Thanks for your reply, the pressure at the rest is passable, but could be better.
Any idea how much a pump would be please?
I am good at DIY but not sure I can legally fit one as it's a rental property.

I spoke to a plumber today who said it's not a good idea as they are noisy, he recommends a new boiler at over £3k as it's awkward because the pipework is now for a back boiler.

 

[HERTS P&D]

Are you the landlord or renter?

Andy

 

[Exedon]

Don't you just love the combi box slingers! answer to every problem lol.
As its a rental property maybe have a conversation with your landlord?

 

[Deleted member 267285]

I spoke to a plumber today who said it's not a good idea as they are noisy, he recommends a new boiler at over £3k as it's awkward because the pipework is now for a back boiler.

Sounds like work creation to me.

 

[Gary111]

I am the landlord, I had another plumber round today, he said it l would be possible to increase the pressure by raising the tank into the loft. Then run a cold feed also from the tank (not the mains as it is now).
Both hot and cold would then be the same pressure.

 

[Gary111]

May be worthwhile me spending the extra on a combi boiler though as I need to increase energy efficiency generally.

 

[HERTS P&D]

Fit a booster pump next to the cylinder, this can boost water to all tank feed taps.

Stuart Turner Monsoon Universal Regenerative Twin Shower Pump 3.0bar - Screwfix

Order online at Screwfix.com. Positive and negative head. 3.0bar. Premium quality brass pump designed for installation into vented systems to pump both hot and cold water supplies, boosting both equally to an individual shower, complete bathroom or whole house. FREE next day delivery available...

www.screwfix.com

Not cheap but the best.

Andy