15 ltr unvented water heater.

[Ian10261]

I gotta fit an undersink unvented water heater, requirements are 15ltrs capacity, will need expansion vessel, PRV, safety discharge etc as its on a normal mixer tap and the expansion cannot be accommodated within the mains. Heatrae stuff is too pricey for this job, anyone fitted similar for a reasonable outlay ??

 

[SimonJohns]

Tried santon?

 

[dontknowitall]

Ariston Europrisma 2Kw 10 litre?

Edit ... after reading the question properly!!

Ariston Europrimsa 2Kw 15 litre?

Just looked up internet prices and is from around £110. I paid £155 at a merchant (sniff!)

Expansion vessel extra and I think the PRV was too so if a Santon includes all these then it might be a better buy.

 

[stevetheplumber]

just fittted a ariston 15l and the prv comes with it

 

[Ian10261]

Cheers lads, its looking like the Ariston i reckon.

 

[AdamMcC5]

Did you try redring? There usually cheapish

 

[SimonG]

Hyco speedflow, fitted a few an had no issues. Bought online from dealec.

 

[fuzzy]

thought the safety devices were not needed below 15litres, do they not do any 14.5l ones?

 

[SimonJohns]

thought the safety devices were not needed below 15litres, do they not do any 14.5l ones?

No. You just don't need a ticket below 15L

 

[fuzzy]

okaaayyy, i may have to visit some old jobs tomorrow! lol

dont some of the smaller ones not need expansion vessels?

 

[dontknowitall]

I think they all do - certainly the one I fitted required one.

 

[GQuigley67]

they need expansion vessels if the mains is high pressure or if it is within a certain distance of nearest cold draw off point, MIs should tell you if its needed.

 

[Ian10261]

I've had to get an expansion vessel and a PRV for the one i'm fitting next week.

 

[blayedrunner]

fitted a zip one and it needed 1 if it couldnt be taken up in pipework

 

[fuzzy]

so its dependant on Mi's and length of run to CW outlet etc

i suppose most will now suggest one, safety first, i did fit them 15 years ago without, but to the Mi's back then

 

[LegionellaSlave]

Try Newlec mate.
They were cheap a few yrs ago.

I have seen some fitted without exp vessels but i think it depends on the pressure.
The old redring ones used to have three different ways of installing depending on the pressure.

 

[GQuigley67]

i converted a building from indirect to direct, after that they complained of there 10L water heater PRV dripping, turns out it wasn't need when it was gravity fed(probably around 8-10m of head at least) but once i converted it to mains (3-4 bar at least) it caused problems

 

[AdamMcC5]

Anyone seen the coil of hep trick under the sink instead of installing a pressure vessle?

 

[SimonJohns]

Anyone seen the coil of hep trick under the sink instead of installing a pressure vessle?

No but sounds like a great idea :s

 

[AdamMcC5]

I seen it being done once, they put a coil of hep and put it under the sink...must be to do with the nearest outlet and instead of putting a vessle in.

 

[SimonG]

Be cheaper than a vessel! I think it's about 2.4m to first point of use, 3m of speedfit about £3.

 

[GQuigley67]

the distances vary but does seem like a good idea as the vessel kit is £100 upwards