Hi Plumbers,
I have a low pressure hot water cylinder with wetback but my hot water pressure is lousy.
Can anyone provide me with good advice on how best to fix this.
I want to retain the wetback - it's only a couple of years young!
What are options - a booster pump?
The open vent pipe is already reaching the sky & the water shoots out the exhaust when the fires cranking.
The ajax is already wound up as high as it will go before spilling.
A plumber installed parallel ajax valves but this hasn't improved anything.
Any suggestions?
I need a good plumber - I'm in Napier Hawkes Bay.
Look forward to hearing from you.

Craig

Hi craig, parallel ajax valves wont do anything for pressure - it allows increased flow in times of simultaneous/multiple hot water draw-off from fixtures

you have three options - you mentioned two

1/ increase exhaust height, go to a 7.6m prv = cheapest option
2/ install hot water booster pump - this should be installed AFTER tempering valve = mid point cost wise
3/ change to mains pressure HWC with wet back coil = most expensive option

cheers

Get rid of your tempering valve.

hi guys/roberto, i don`t believe that is true where is that written? can you produce the reg or paper that states what you are saying,cheers

Hi I'm here to put a washer on your orb but I've noticed you don't have a tempering valve. I'm going to have to put one in and it's going to cost you $400.

But I don't have $400

I'm sorry but I legally have to install one. Go get your cheque book.

Get out of my house

I'm sorry but I'm installing a tempering valve.

I don't want one get out.

I'm putting one in get out of my way

I'm calling the police

Have you actually ever put a gauge on the shower to see what pressure you physically have?

It is a bit silly to suggest removing a safety device and performing an illegal practice, so don't remove the TLV.

HWC's usually have a pressure rating, so the height of the exhaust should be from the base of the HWC.

You cant increase the hot water pressure more than the HWC pressure rating.

A TLV installed at the lowest point as possible increases the performance of the valve i.e. the lower it is installed, the more pressure there is to force water though it.

There are a few different shower roses/hoses that perform better under low pressure than others, shop around.

If any of this helps, good luck,,,, it its crap, let me know.

you're right about certain advice been illegal there A1

under health & safety act if you dont take all practicable steps to ensure safety of yourself and others you are held responsible

would it stand in court?  dont know - havent taken the risk to find out

as for where and when tlv's are req to be installed that is up to each individual T.A

imho it is good trade practice to install safety valving, E.Q straps etc on any installation if you are doing any sort of work at any particular property, im sure all would agree - 99% of the time when asked for quote etc for any work this is checked - the client/property owner is informed of dangers/hazards present and is quoted based on this

99% of clients are glad to be informed of this and much work is gained through this advice alone

as has been stated, if property has been plumbed correctly in the first place for low pressure hot water system with all valving set up properly there wont be an issue - the layman would not be able to tell it wasnt a "mains" pressure system...