DHW tanks



300 à 10 000 Litres

CE compliance

Immersion heaters or electrical cartridges

Stainless steel AISI 316L tank

"RC" internal coating (WRAS approved material)

The electric heater is most often used in domestic hot water (DHW) storage systems in residential properties or industrial premises. It makes it possible to amass a reserve of water from electric elements fixed directly onto the tank and operating at night during off-peak hours (in accordance with the enrgy supplier’s tariff) .

The volume corresponding to the daily requirement is heated outside the hours of use and thus allows tapping without flow restrictions linked to the installed power.

There are two types of electrical equipment available :
• Immersion heaters : the heating elements are directly immersed into the water requiring heating.
• Cartridges : the heating elements are inserted into stainless sleeves ; the lack of contact with the water avoids corrosion or scaling on the heating elements and also enables disassembly without the need to drain the tank.

The electric water heater is available in four different versions of tank to meet all needs :

"RC" coated carbon steel

Type of coating




0.3 à 10 m3

0.3 à 10 m3

T° max



Duration T° max



Stainless steel

Nature of the stainless steel

316 L stainless steel


0.3 à 10 m3

T° max

95°C constant

Special resistance to chlorinated shocks


AdvantagesTechnical descriptionDocumentaries



Multi-purpose: suitable for use with energy recovery systems (preheating).
• Significant hot water storage capacity to meet peaks in demand.
Temperature stability for distributed DHW.
• Can be used a constant temperature of up to 95°C (depending on the model).
Cost-effective solution (heating element directly integrated into the tank).
Quick and easy to install: equipment delivered to site with pre-assembled thermal
equipment (can be easily removed if required).
Easy to maintain: cartridges can be removed without the need for draining.
Extended warranty for stainless steel version.
Non-standard versions available on request.

Technical description

  • Tank
    • Vertical carbon steel tank with 3 feet.
    • 300 to 10 000 litres capacity.
    • Maximum working pressure = 7 bar.
    • Test pressure = 10 bar.
    •Nozzles (in accordance with the following diagram).
    • ø 400 mm inspection manhole(1).
    (handhole with a diameter of 250 mm for 300
  • Internal coating
    • Finished with “RC851” coating
    (Maximum temp = 85°C constant).
    • Magnesium protection anode(s) with wear
  • External protection
    • Anti-rust paint
  • Removable thermal insulation
    (including the inspection manhole and the bottom of
    the tank)
    M1 fire rated:
    • High-performance mineral wool – 60 mm thick
    (λ = 0.032 W/m/K).
    • Flexible PVC jacket
    M0 fire rated:
    • Rockwool – 50 mm thick (40 kg/m3).
    • Isoxal metal sheet jacket.
  • Electric immersion heater(s)
    • Reinforced incoloy resistor(s).
    • DN40 threaded cap up to 12 kW, M77 beyond
    • Voltage – three-phase 230/400 V up to 24 kW,
    three-phase 400/700 V beyond that.
    – Immersion heater fixing: on the tank or the
    manhole as required
    • Immersion heater fixing on the manhole .
    • Temperature regulation:
    – Electrical power ≤ 20 kW:
    Three-phase control/safety box 30 A, 400 V,
    fitted to the top of the immersion heater
    (double safety thermostat + cable switch).
    – Electrical power ≤ 20 kW:
    Double unipolar safety thermostat.


  • Electric cartridge(s)
    • Removable, supplied in a stainless steel sleeve.
    • Low head loss (6 W/cm2).
    • M77 connection.
    • Double unipolar safety thermostat.
    • Cylinder lock on the manhole or/and on the tank.
  • Options
    • Accessories kit (thermometer, DN25 safety
    valve, DN50 drainage valve, Air vent valve).
    • “RC951” finish (T-max = 95°C peak).
    • Non-standard versions available on request.
  • Warranties (in accordance with our general conditions of sale)