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Unvented Under Sink | 2Kw Water Heater | 'Fast Flow' |10L

Product Code: 132783

57 reviews
See more product details
  • This product is discontinued
  • Warranty: 1 Year
  • 30 day money-back guarantee
  • Have a question? Call 0800 091 3171

Product information

Brand - Crown
Height - 46 cm
Width - 34.4 cm
Depth - 20.3 cm

This Rapid Fast Flow Unvented Undersink Water heater has proven to be the most reliable undersink water heater hsd has ever sold. Sales running into the thousands and fantastic customer feedback along with literaly no returns. You can buy the Fast Flow with total confidence.

Full 9-5 Weekdays Technical & Installation Telephone Support

Our NEW TOP QUALITY 10 and 15 Litre Under Sink Electric Water heaters are constructed from quality materials and designed to a very high standard.

Installation is simple, with all component parts easily accessible, and it is a compact unit.
The size means that it can fit into the most confined spaces.

The ½" inlet cold water pipework connections are spaced 100mm apart, making the unit interchangeable with most heaters on the market.

Our heaters are suitable for connection to conventional taps.
As standard, the Rapid heaters have a two-year vessel guarantee and are despatched complete with a Safety Valve.

* Simple installation
* All components easily accessible
* 1/2" inlet cold water connections makes
the unit interchangeable with most
heaters on the market
* High impact-resistant casing
* 2-year vessel warranty


Rating 4.8 out of 5 based on 57 reviews.
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Showing 1 to 10 of 57 Reviews
Henry, Derbyshire
2nd one purchased ideal for cloakroom instant hot water
8 May 2013
Steve, Berkshire
good product previous one lasted well even in hard water area.
8 May 2012
Leslie, Nottinghamshire
thank-you for your quick reponce to my request for a under sink water heater, it was delivered within your specefied time, and proved to be an excellent buy,with hot water on tap with no cold water waste, i'd recommend it to anyone .
24 Mar 2012
Richard, Somerset
16 Nov 2010
Andy from Bristol
It is a great water heater!!!! I am completely happy with it! Thanks, Mr Andras Dorko
23 Dec 2009
product arrived as described and on time. Thank you will use you again.
25 Jul 2009
Dawn, Hertfordshire
all working fine thank you
10 Jul 2009
Jennifer, Derbyshire
An excellent product. We have been using it just 2 wks, and are really impressed. The water is heated so quickly. Would definitely recommend.
30 May 2009
Colin, Somerset
I have found this to be an excellent product it does exactly what it says. Thanks very much. Colin from Somerset
11 Apr 2009
Walter, Manchester
This is truly a great water heater. I had no trouble installing it and it is very efficient.I would have no hesitation whatsoever in recommending this heater it looks good when mounted although mine is out of sight in the loft behind the wash basin
10 Mar 2009

Documents & Instructions

Frequently asked questions

could i replace the emersion tank with one of these to feed bathroom sink and kitchen sink only in bunglow ..useing existing pipe work ,,
We would recommend a water heater of at least 15L. The 10L option may struggle to provide water to the kitchen sink.
Hi RE: 10Ltr rapid 'fast flow' undersink unvented water heater 2Kw. Can you please confirm this unit has a total depth of only 203mm as I need to fit it in a very tight space. Many Thanks
H 460 W 344 D 203 is the correct size of this unit. 
I am installing a downstairs shower room next to a utility room. Would this unit run a shower, basin and sink?
This unit is not suitable for your needs. A 70-120 litre unit would be required or a 9.0KW to 13.0KW instant water heater would be needed. 
I need an undersink water heater to supply 2 sinks, both have mixer taps and the cold water to these is fed from the mains cold water supply. Is this unit suitable, and if not can you suggest a suitable one please. Many thanks
It would depend of the type of sink involved. A hand wash basin would be okay for the 10L, but a kitchen sink would be more suited to the 15L. Please be aware that there will be a reduction in the flow rate if both sinks are used at the same time. If this is an issue, a water heater would be better for each sink.
In my new retirement flat, the water tank and immersion heater are in a cupboard in the hallway, about 18ft away from the kitchen sink and about 9ft away from the bathroom sink. The kitchen sink cold water comes from the mains. The bathroom sink is fed
This water heater would be suitable to supply water to a bathroom sink, but we would recommend at least a 15L water heater to provide sufficient water to a kitchen sink. Please follow the link below to the 15L version:

We also recommend for you to confirm with a qualified plumber/electrician if the products are suitable for your requirements before purchasing.

Please could you confirm whether any optional extras are required with this unit? It's very confusing to know what valves vessels and brackets are needed!! Thanks
The need for an expansion vessel would depend on the distance the water heater is installed from the mains water inlet. If the distance is less than 2.8m of 15mm piping for a 10L unit, then an expansion vessel is required. If your mains water pressure is more than 6 Bar, then a pressure reducing valve is required. Please read to guidance notes, and also consult a qualified plumber/electrician to discuss your specifications before purchasing.
could a heater of this type supply a bath?
No, this heater would not be suitable for a bath. You would need a water heater of at least 80 - 100L to sufficiently provide water to a bath.
I've got a water leak under the sink which appears to be coming from under the heater. Is this possible?
May we ask you to check the connections that the water inlet and outlet pipes are not loose. The water heater itself should not leak. If it is not the water connections and you can confirm where the leak is coming from, and it is from the water heater, call our Sales Team for further advise.
Does this heater have a reset switch ?
The reset button is underneath the cover at the top of the heater. 
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