Discuss Fitting a small undersink water heater in the DIY Bathroom Remodelling Advice area at PlumbersForums.net

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Hello Everyone

I will be fitting a vanity unit into a downstairs shower room, there is only a cold water pipe and I need to fit an undersink water heater for the hot water.

The vanity unit will be occasional use, and I need to fit it within the vanity unit as the client does not want to see any pipework or the unit. So it needs to be small and I think a vented unit as there will be no room for an expansion vessel etc. I was looking at a Hyco Handyflow Undersink unit

Handyflow Undersink | HYCO Manufacturing

with a 5 litre capacity . It is a vented unit and comes with its own tap, seems ideal.

Does anyone have any other ideas?

With this unit you need to use their tap but the clients would really want a different tap which would not work with this unit as it needs to be vented.

Any other ideas would be greatly appreciated. I have also looked at the Ariston water heaters, see below, which I guess would work with an ordinary tap?

Aures Slim Multi - Electric Water Heaters - Ariston Thermo


Many thanks

Paul
 
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Ben-gee

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Just use a little unvented undersink, you can use any tap.
You don’t need an expansion vessel if you do the pipework to accommodate the expansion - you will however of course need a pressure relief valve and discharge from this.
Read the manual, I have done this in the past by having a loop of speedfit of appropriate length tucked away behind the unit.
Don’t ask them if they’d like an omelette, they probably wouldn’t want you to break any eggs!
 

WC1

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Edit
Sorry , I meant you may need a g3 ticket for any invented cylinder. Instant , non storage as you had originally is good
 
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Edit
Sorry , I meant you may need a g3 ticket for any invented cylinder. Instant , non storage as you had originally is good
Thanks, yes I have a G3 ticket, but I have little room to work with so just want a basic vented undersink tap
 

WC1

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In a very small, (micro) kitchen - John strand stuff, I have once run a snake of 22mm copper at the side of a kitchen cupboard with streets and elbows to accommodate expansion. from memory it was 1.4 metres as per mi's . Bit of a faff but got it done within regs and mi's.
 
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In a very small, (micro) kitchen - John strand stuff, I have once run a snake of 22mm copper at the side of a kitchen cupboard with streets and elbows to accommodate expansion. from memory it was 1.4 metres as per mi's . Bit of a faff but got it done within regs and mi's.
Thanks for the update. Looks like a good idea and then they could use there own tap
 

Ben-gee

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pretty sure i just said all that!

and you don't need g3 for those little ones.
 

WC1

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Hi Ben, I wouldn't go for plastic near any heater, on the hot or cold side. I believe you do need g3 even for little ones. There's a thread somewhere.
 

ShaunCorbs

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you do need to be g3 registered
 

Ben-gee

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ah ok my mistake, i thought it was not required up to 10litres - I must have that wrong or maybe it's changed within living memory.
I s'pose I need to get my G3 ticket in that case, then I can graduate to the bigger ones too. Lots of people want them these days, including me at home in near(ish) future...
 

ShaunCorbs

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Pretty sure it is 10 or 15 L without unvented ticket
Nope need qualification only difference you don’t need to register install with bc
 

rpm

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Does that apply to the likes of these hot taps?
 

ShaunCorbs

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Yes
 

ShaunCorbs

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Is there any documentation for this, only my company thinks the same as did I that you don’t need to be G3 registered? I asked local bc and iirc even they said no?
In the bc g3 document online
 

ShaunCorbs

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2010 is the year I think
 
B

Burger

2010 is the year I think
Ah,makes sense, I asked bc many years ago. However cba looking now, but I’ll have a proper read tomorrow. I’ve just skimmed over it and can’t see anything, just a small paragraph on unvented heaters of 15L or less will generally satisfy g3(3).
 
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