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EnergyPro® cylinders for boiler systems

Nu-Heat's EnergyPro® indirect unvented cylinders work with a gas or boiler as the primary heat source. An immersion heater is factory-fitted to provide short-term, occasional backup for the water heating.

Cylinders in Nu-Heat’s EnergyPro® range meet all relevant UK and European standards and are covered by a 25-year warranty.


  • Lightweight duplex stainless steel construction
  • High flow rates (up to 50 litre/min) with minimum pressure drops
  • Pressure tested to 10bar
  • Insulated in excess of the requirements of Part L, using CFC- and HCFC-free fire-retardant foam with a Global Warming Potential of 2.8, and Ozone Depletion Potential of Zero
  • Smooth-walled coils for good heat transfer and low pressure drop
  • Supplied complete with connection fittings, and G3 equipment comprising inlet group, tundish, temperature and pressure relief valve (factory fitted) and wholesome water expansion vessel
  • Optimum connection positions at the front of the unit for ease of installation, easy access and minimal space requirements
  • Connection for optional EnergyPro® Hot Water Loop
  • Powder-coated case


EnergyPro® indirect cylinders for boiler systems
 EN200  EN300  EN400  EN500
 Total capacity (litres)  194  290  390  495
 Standing loss (W)  78  92  102  115
 Cylinder weight when full (kg)  256  373  501  617
 Boiler/HP coil surface (m²)  0.67  0.77  1.16  1.25
 Energy efficiency class  C  C  C  C


EnergyPro® indirect cylinders with solar coil for boiler systems
 EN300S-A  EN400S-A  EN500S-A
 Total capacity (litres)  290  390  495
 Standing loss (W) at 65°  92  102  115
 Cylinder weight when full (kg)  378  477  630
 Boiler/HP coil surface (m²)  0.64  0.77  0.77
 Solar coil surface area (m²)  0.77  1.15  1.28
 Dedicated solar volume  167  199  284
 Energy efficiency class  C  C  C


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