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Perfect 55 Instant Undersink Instant Water Heater, 5.5KW
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Product information
Specifications
Power:
5.5 kW
Brand:
HSD
Height:
15.2 cm
Width:
13.5 cm
Depth:
7.2 cm
Weight:
0.9 kg
A Compact Instant Water Heater
This compact water heater is ideal when you’re tight on space. It fits neatly under your sink, where it’s easy to hide out of sight, and provides hot water to any sink or wash basin. If an immersion heater or water boiler isn’t practical – for example, in a small, isolated workshop or shed – this instant water heater is the perfect solution.
Dramatically Reduces Waste Energy
As it doesn’t store hot water at any point, this instant water heater dramatically reduces the amount of energy you’ll waste. It means you’ll only ever heat up water as you use it, and it’ll stop using energy as soon as you shut your tap off.
Ideal for Sheds, Workshops, and Other Areas Without Hot Water
For some places, it’s not always practical to plumb in hot water. Fitting boilers and hot water tanks often requires invasive and expensive building and plumbing work, and if you have a shed or garage that needs hot water, it might not seem worth it. This instant water heater is small and simple to install, fitting neatly beneath your sink. This means it can be installed almost anywhere with minimal cost and effort.
Provides Hot Water at a Fast Flow Rate
When used under sinks and wash basins, it provides hotter water at a faster flow rate than most other instant water heaters. It can provide 1.5 litres of water a minute at a temperature of 62 degrees. Faster flow rates will be slightly cooler, but the 5kW heating element inside the unit means it can give warm water at flow rates of up to 3 litres a minute.
Permanent 6.5 Bar Water Pressure
This water heater pumps water at a perfectly even 6.5 bar water pressure, providing an even flow rate even if you fully open your taps.
Designed to Use with Any Tap
As it fits into the pipework below your sink, you can use this water heater with any tap. This gives you the freedom to use it with any sink or wash basin.
- Minimum water pressure required 10psi or 1.0 bar
- Cold water inlet temperature during winter based on 15C
- Cold water inlet temperature during summer based on 20C
- 25 amps fuse needed
Reviews
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Claire Taylor
Brilliant little water heaters have used them multiple times now
28 Oct 2024
Krzysztof Grubalski
xzzzzzzzzzzzzz
30 Apr 2024
ANGRY CUSTOMER
Water Could be warmer but a great product
2 Nov 2023
Mr Paul
Have fitted it yet but looks
a good product for price
Good delivery
14 Aug 2023
Helen
Very good little device. It heats the water almost instantly to a comfortable hand washing temperature. It is very small so fits easily into a cupboard under the sink
30 Jan 2023
Derek
Good product, fast delivery
3 May 2021
Kris
Very nice small instan water heater. Easy to install and maintenance. Water is hot very quick.
28 Apr 2020
Philip A. Farr
Small but with great water heating power, very neat looking under sink.
3 Sep 2019
Tim Metford
Great product at a sensible price. Quite easy to install and it works a treat! The flow rate out of the hot tap is much better than I expected, so handwashing is a breeze with the instant hot water instead of waiting ages for the boiler to send it through.
6 Nov 2018
Simon
Really happy with this. Used in a log cabin that takes a feed from the mains in the house. Not overly powerful but completely acceptable given the power on the mains feed. It gets nice and warm almost instantly.
29 Aug 2018
Documents & Instructions
Frequently asked questions
Can it be mounted above the sink upside down. Or on an angle as the sink is over the staircase and the cupboard below hasn’t got a vertical wall suitable for fitting
No, it is not suitable to be mounted on an angle or upside down.
Please see the installation manual below
https://www.hygienesuppliesdirect.com/files/static/%20perfect%20_pressurized_water_flow_heater_instructions.pdf
Please see the installation manual below
https://www.hygienesuppliesdirect.com/files/static/%20perfect%20_pressurized_water_flow_heater_instructions.pdf
Hi I want to use the heater to boost solar hot water in colder times. What is the max incoming temp for the water?
The maximum inlet temp for the water is 25* ambient.
Hi
Can the 5500 unit be used in a bathroom to provide hot water to a shower and a sink ? They can be used simultaneously or one at a time ? Can the intake be supplied from a water pump ?
No.
Hi, we have hard water also want to supply kitchen sink plus toilet hand basin from same unit.
Both will be occasional use
If they are not used at the same time for occasional use.
Hi can u run a basin an a kitchen sink tap with this product
The Perfect 55 is for a kitchen sink light use and we would recommend the Perfect 35 for a clook room basin.
I have just purchased a Perfect 55 water heater. Does the electric cable exiting the unit just connect to a UK 3 pin plug and what value should the fuse be in the plug. Thank you
No, A 25amp fuse is required by a qualified electrician.
Please see the installation manual below
https://www.hygienesuppliesdirect.com/files/static/%20perfect%20_pressurized_water_flow_heater_instructions.pdf
Please see the installation manual below
https://www.hygienesuppliesdirect.com/files/static/%20perfect%20_pressurized_water_flow_heater_instructions.pdf
Hi, would this unit be suitable for a small bed sit, including sink, bath and basin. Thanks mark
No, it is not suitable for a bath. It could be used for light use only for your sink. Then the Perfect 35 or 45 could be used for your basin.
Or electric immersion tank is fairly small due to space limitations. This means if we are cleaning the dishes, we often run out of hot water for showers and have to turn the immersion on again - which is expensive. I’m looking for a suitable under-sink instant water heater for us to have running when we do the dishes. This would mean infrequent use but occasions when we’d need to run the tap for 15 minutes or so. What tankless solutions are available? Is this product suitable, as I don’t
It is designed to fill a bowl a few times a day. So light use only.
We would recommend using the Redring 15l undersink water heater
https://www.hygienesuppliesdirect.com/products/prod150320-redring-3kw-unvented-undersink
After filling the sink you would need to wait while it heats up another 15l of water.
We would recommend using the Redring 15l undersink water heater
https://www.hygienesuppliesdirect.com/products/prod150320-redring-3kw-unvented-undersink
After filling the sink you would need to wait while it heats up another 15l of water.
I have an existing broken unit i am replacing. That was 9kw and fed by a 10mm cable. Will that existing cable be ok for this unit? It has a 25W fused spur.
Please see the water flow linked below
https://www.hygienesuppliesdirect.com/files/static/%20perfect%20_pressurized_water_flow_heater_instructions.pdf
This will not give the same temperature and water flow as your 9kw.
https://www.hygienesuppliesdirect.com/files/static/%20perfect%20_pressurized_water_flow_heater_instructions.pdf
This will not give the same temperature and water flow as your 9kw.
Would the perfect 55 be suitable to supply a hairdressing back wash unit
You would require one water heater per sink.
What is the maximum I can fit the 55 from the tap.
No, this connects to the cold feed under your sink.
https://www.hygienesuppliesdirect.com/files/static/%20perfect%20_pressurized_water_flow_heater_instructions.pdf
https://www.hygienesuppliesdirect.com/files/static/%20perfect%20_pressurized_water_flow_heater_instructions.pdf
Which model is best suited for a single hairwash sink in a barbers? Probably used once every 20 minutes.
Yes, this would be suitable along with the Perfect 45 Instant Undersink Water Heater.
I need an under sink water heater for use in a shed that in winter may get below freezing. Does the Perfect 50 come with frost protection, or does it not need it, or would I be advised to drain the heater down before the onset of winter?
This unit is not designed for outdoor use.
Our building has no gas supply and no water tank in the loft. Currently hot water is supplied via a Zip under sink 15 litre tank which gets switched on as needed. People have complained that there is not enough hot water to wash up after a 2 course meal
Unfortunately this item would not be suitable for what you are needing.
How many liters is the perfect 50?
The Perfect 50 is an instantaneous unit. This means that it produces hot water on demand and doesn't preheat a set amount of water.
Hi
I want it to work a sink for washing up in a road side porta cabin cafe i am worried about low water pressure i have a 25ltr tank with a submersible pump of which is a small caravan whale type.
regards
Roger
This unit is an instant water heater therefore it does not have a tank to hold water. The minimum water pressure this operates from is 1.0 bar. For full product information please click on the PDF under the section on the product page instructions and informational documents to view the full unit instructions.
Hi my name is enrico
i have 3 barber shop 2 of them have no hot water.
friend of mine recomend you and advised me one of the undersink hot water system .
as will be used for washing hair which product you recomend for me for my kitchen and basin which is
This unit would be fine for your kitchen sink but you could not wash hair with this unit as it is not powerful enough and would burn the element out as it would be over used. 153822 would be the type of unit required these units power showers and that is the type you would require for washing hair. These need to be spurred in by a qualified plumber and electrician.
Does the unit automatically come on when the basin tap is turned on, or does the unit have to be switched on before using the taps?
The unit automatically comes on when the tap is turned on.
Can this heater be connected to the hot water pipe? reason is we have a bungalow where the cylinder is a long way from the kitchen hence large amount of water in the pipework has to run before hot reaches the tap.
thanks
No these units have to be connected to the mains cold feed only.
Figure 2 in the Wijas installation guide suggests I could connect to a ring main. Is this true for the 5kW?
You can connect to a ring main but you must install with a 25amp fuse at the spur.
Hi, need a heater to run a shower in a converted shed, water comes in from mains plastic pipe and 15mm copper in the shed has been lagged ,would this be powerful enough to heat?
have a 6mm cable and 32a fuse in the distribution board
many thanks
tony
We would not recommend this water heater for a shower.
How many Amps does the Perfect 50 pull as we live in a caravan and can only draw 30amps max.
A 23.9amp fuse is needed for the Perfect 55 Water Heater.
If the unit is suppliying a mixer or monobloc tap does it need to have its own cold supply?
Thank you.
Only one cold water supply is needed, but you will have to T off from this supply to go to the water heater, to create a supply to the warm tap, and still allowing the same supply to continue to the cold tap. On some Monobloc taps, the cold water may need to be slowed down to balance with the flow rate of the warm water. If you would like more information please call 08000913171.
The instruction manual only shows minimum cross section for 5Kw what is minimum cross section and fuse for 5.5Kw?
I want to use this with a basin which has separate hot and cold taps not a mixer tap. Is this suitable?
The minimum stated factory specifications for the 5.5kw Perfect 55 is 23.9A fuse and the appropriate cable for this is a 2.5mm squared cable. However, we recommend you confirm this with a qualified electrician, as individual requirements are different. You can use this water heater to supply water to a separate hot water tap.
I have to replace a rusted Hyco under-sink heater which uses an expansion vessel. It supplies two toilet hand wash basins. Would this do the job?
Mike Cookson
This water heater would be suitable to supply water to two hand wash basins. However, if they are to be used at the same time, this will effect the flow rate (but not the temperature) going to each sink. If this is not suitable for your needs, please see product codes 107638 or 228763, which are suitable for multiple outlets.
Is the product suitable for a small (25ft) boat? Is a minimum water pressure required?
Unfortunately this would not be suitable for a small boat. This water heater is mains cold water feed only. The minimum water pressure required is 0.75BAR (or 10psi).
Do you know if these are legionella compliant?
Legionella bacteria need a continuous temperature of between 20 and 50 degrees in stored water to grow. As the instantaneous water heaters do not have any water storage, there is no risk of the Legionella bacteria to grow.
Can I connect 2 sinks to one of these units? Unlikely both taps used at once and no problem if they are and water is only Luke warm. Sinks are one metre apart.
We would recommend two heaters, one per tap/basin. However, one could be connected to two basins if only one basin was used at a time.
What is the flow rate at it's hottest if running continuously ?
The flow rate at its hottest temperature (64 degrees Celsius) is 1.5L per minute.
How does the unit cope with hard water? Do I need to fit a descaler or does it not get hot enough to be a problem?
This instant water heater copes extremely well with hard water. Because it doesn't keep stored water at high temperatures, there is no water evapouration involved, therefore no limescale build up.
Would this be ok to wash dishes in a sink ( rather than turning on an immersion switch for hours)
Yes, this water heater can be used to wash dishes in a sink. However, this is for light use only.
I have a log cabin in my garden and want to put a sink in it with warm/hot water to wash up in. Would this water heater do the job?
As long as the log cabin has mains electricity and mains water, the water heater will be suitable.
Can I fit this to any bathroom sink tap?
You cannot use this water heater with thermostatic sink taps. Standard taps, including mixer taps, can be used.
I want to change my old under sink water heater in the kitchen & want to know if your units allow us to use normal taps. Currently ours has a long spindle going down into the hot water pipe & this is a pain.
This water heater can be used with normal taps. You can use either a separate hot and cold tap or a mixer tap (not thermostatic).
Can this be wired in with 6mm cable as that's the cable that is already in place
You should use 2.5mm with a 25amp fuse at the spur, but we would always advise you to check with a qualified electrician.
Building a tinyhouse would,would the 55 be suitable under the sink,water fed via 12v submerged pump in water tank.
This would be suitable if your pump had the power to deliver at least 1 bar of pressure.
Please note that an HVLP (High Volume Low Pressure) pump would not be adequate for this water heater.
Where is the thermal protection button in the perfect 5000 model
It is in the centre of the unit between the connections.
Would this affect drinking water from tap
No. Your cold water will stay the same.
Do I need an expansion tank in the plumbing system is unvented
As this is an instant water heater and does not hold any water, an expansion vessel is not required.
Can this water heater temperature be adjusted
Regards
The temperature flow rate is based on inlet temperature 15C
3ltr minute is approximately 41C
2.5ltr minute is approximately 46c
2ltr minute is approximately 54c
1.5ltr minute is approximately 64c+
3ltr minute is approximately 41C
2.5ltr minute is approximately 46c
2ltr minute is approximately 54c
1.5ltr minute is approximately 64c+
What is the maximum water pressure for this unit. Will it cope with being fitted close to the mains supply?
The maximum water pressure for this unit is 10 bar. The unit can be fitted close to the mains supply.
After fitting one of these units is there any problem with the water in the old (capped) hot water supply just sitting in the pipe for years?
The Perfect 55 fits direct to your cold water feed. Please check with a qualified plumber regarding your capped hot water supply.
Is this unit capable to run a kitchen sink and small basin
No this is not suitable. We would recommend the Crown 15l for your kitchen sink. https://www.hygienesuppliesdirect.com/products/prod205137-fastflow-pro-under-sink-water
The Perfect 35 is suitable for a cloakroom sink. The Perfect 45 is suitable for a bathroom sink.
The Perfect 35 is suitable for a cloakroom sink. The Perfect 45 is suitable for a bathroom sink.
In question six you state 6mm cable req. Q12 you state 23.9 fuse with 2.5mm cable. In q23 you state 6mm cable would need to be reduced to 4mm/2.5. clarification would be appreciated. Also what size flex is required to connect to spur?
Please find link to the installation manual for this water heater.
The manual states 2.5mm with a 23.9amp fuse.
http://www.ascot-hygiene.co.uk/usermanuals/Manual%20P3500-5000B.pdf
The manual states 2.5mm with a 23.9amp fuse.
http://www.ascot-hygiene.co.uk/usermanuals/Manual%20P3500-5000B.pdf
Can this unit be connected to a standard kitchen socket?
This water heater should be fused into a spur with a 23.9amps fuse, so it cannot be connected to a standard kitchen socket.
I want to use this heater in a re-circulating, pumped system to heat water up to about 80°. The unit can operate up to 10bar but can it work safely at 80°C (safety pressure relief will be in place)?
No, the maximum pressure is 10 bar.
Could you explain in simple terms how this would need to be wired up? We've read the instructions, sorry we're not qualified electricians + not sure what is being described
This unit does have full instructions however it will require a qualified tradesperson to fit the unit due to the manufacturer warranty.
Why can this not be fitted to a 30 amp ring main
This must be installed with a qualified tradesperson. The power supply required would be a 25/32 RCD breaker.
Please see the deocuments and instructions for installation.
https://www.hygienesuppliesdirect.com/products/prod133365-5-5kw-instant-water-heater-undersink
Please see the deocuments and instructions for installation.
https://www.hygienesuppliesdirect.com/products/prod133365-5-5kw-instant-water-heater-undersink
How far away can the top be from the unit
Please see the instruction manual below for your qualified fitter.
https://www.hygienesuppliesdirect.com/files/static/%20perfect%20_pressurized_water_flow_heater_instructions.pdf
https://www.hygienesuppliesdirect.com/files/static/%20perfect%20_pressurized_water_flow_heater_instructions.pdf
Where is the thermal protection but
There is a small oval button in the middle of the heater jacket in a small box with 4 small screws.
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