Dexpro Delux Digital Instant Water Heater - 3.5kW

Out of stock
Warranty :
2 Years
Delivery :
4-6 Weeks
  • Digital Temperature Display
  • Supplied with Standard Flexi Hoses or Push Fit on request
  • Power: 3.5kW
  • Energy Class Rating: A

Dexpro Delux Digital Instant Water Heater - 3.5kW

The Delux instantaneous water heaters are ideal for use where space is a premium and hot water is needed for hand washing in commercial applications such as, offices, shops, factories, schools/universities and hospitals.

The unit also boasts a digital temperature display with an accurate touch control.

The water temperature rise from the surrounding conditions is affected by the water flow rate and it is recommended that a flow/spray tap nozzle is used to attain the required temperature and performance 3.5kW <2lpm.

As the water temperatures vary throughout the year, winter may result in the incoming water temperatures to be of 10°C or below and the summer temperatures can be upward of 15°C.


  • Digital Temperature Display
  • Supplied with Standard Flexi Hoses or Push Fit on request
  • Power: 3.5kW
  • Energy Class Rating: A
  • Adjustable Flow Conrol
  • Accurate Digital Temperature Control
  • 1/2" inlet / outlet connections 
  • Supplied with ½ inch brass connection adaptors
  • Recommended for use with spray head taps to attain desired water temperat
Type Instant Water Heater 
Power (kW) 3.5
Current Intensity (A) 15.2
Minimum Cable Size (mm) 1.5
Minimum Water Pressure (Bar) 0.6 (8.7 PSI)
Maximum Water Pressure (Bar) 6.5  (94 PSI)
48C Flow Rates (l/min) * 1.5
40C Flow Rates (l/min) * 2.0
35C Flow Rates (l/min) * 2.5
Height / Length / Width (mm) 160 / 210 /  50
Installation Type Any orientation
Water Proof Rating (IP) 24

What water temperatures can i expect with this water heater?

"All depends on the water inlet temperature". The Dexpro is supplied with M22 and M24 flow restrictors. The M22 flow restrictor will limit the flow of water to 1.5 litres per minute and the M24 flow restrictor will increase the flow to 2.5 litres per minute. If the cold water inlet is 10C expect 44C at 1.5ltr min. If the inlet water temperature increases (during summer months) expect 49C at 1.5ltr min.

Can this instant water heater be fitted upside down above or under the sink?

Yes it can, the Dexpro can be installed in any orientation, up - down - sideways, etc, so can never be fitted the wrong way. However the digital display on th efront is fixed so if the water outlets are facing upwards the temperature display would be upside down, please see attached downloads.

Do i need an expansion vessel for this instant water heater?

No, ALL Instant water heaters do not require an expansion vessel!

What are the thread sizes?

Male 1/2" BSP standard plumbing fittings for an easy installation! This water heater is supplied with 2 x  flexi hoses

Can the Dexpro water heater be fitted with a 13A plug?

No, The Dexpro 3.5kW water heater requires a minimum of "15.2A" power supply with a minimum of 230 Volts (Fused Spur Point required) The cable size should be minimum 2.5mm2, pvc twin + earth, and protect the circuit with overcurrent protection device (OCPD)

Can this water heater be used with standard taps and mixer taps?

Yes it can be used with "standard taps" and "mixer taps" as long as the taps have spray nozzles fitted. The accessories we supply include 2 types of spray nozzle 22 & 24 and will fit most standard size taps. Please check your tap nozzle type before you purchase this water heater. Please note without a nozzle fitted on your tap the water flow rate will be no more than a trickle!

What temperature and flow rates can i expect from this water heater?

This water heater will achieve water temperatures of 49C maximum flow rate of 1.5 - 2ltr/min with M22 nozzle fitted to tap (calculated on a water inlet temperature of 15C)

Do you need any special fittings with this water heater?

No, standard 1/2" BSP fittings. This instant water heater is "unvented" meaning it can be connected directly to cold water mains therefore no other special accessories are required.

I have high fluctuating water pressures will this effect the performance of the water heater?

This water heater is ideal for controlling fluctuating water pressure from 1 - 6 Bar

I would like to supply the water heater from a tank in my loft space will this still work?

This water heater needs a minimum "water pressure" of 1 Bar this is equivalent to 14 PSI. Always make sure the water supply is sufficient enough or the performance of this water heater may be effected. For gravity fed water supplies the tank must be at-least 5m higher than the water heater itself!

Can this water heater be used to feed more than one sink?

This water heater is to be used for one outlet only a small sink or hand wash basin. Always install the water heater as close to the outlet as possible. Long pipe runs will effect the performance of the heater!

I have hard water supply will this water heater cope?

Suitable for hard water areas, this water heater is fitted with in-line filter that should be cleaned regular if you are in a hard water area.

What power and voltage does this water heater require?

This water heater needs a minimum power of 15.2A / 230V, if powered any less than this then the performance of the water heater "will be" effected.

What is the warranty of this water heater?

The warranty is 2 years, if it fails within this period from date of purchase we will replace with new once we have received the water heater if it is found to be faulty a replacement will be delivered next working day

Can i return if the water heater is unsuitable?

Yes as long as the water heater is unused and in the original box. Return to: Unit 2, North Point Business Park, Off Selby Road, Eggborough, North Yorkshire, DN14 0JT, with a reference to your order number. Email or call 0800 083 0373 to advise us that you are returning. Once we have the water heater back, it will be checked and if unused a full refund will be given excluding any delivery costs we have incurred

What are the sizes of the water heater?

The sizes are in our technical page: Height 150 mm, Width 210 mm, Depth 50 mm

More Information
Warranty2 Years
Quick Code7940
Delivery4-6 Weeks
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