Smart 420

Fast recovery Tank-in-Tank Cylinder - perfect partner to a condensing boiler

# 06618601

  • External heating source
  • Tanks
  • Floor installation
  • Stainless steel construction - no annode protection required.
  • High quality insulation: 50 mm rigid polyurethane.
  • Easy access control pod with thermostats and six pin plug for simple electrical connection
  • hard wearing polypropylene finish
  • vented or unvented use
  • Mains pressure systempak available
  • Residential or commercial use
  • Can be used in battery formation for higher hot water output.
  • Tank-in-Tank technology


  1. Auxiliary connection DHW
  2. Domestic cold water inlet.
  3. 50mm rigid polyurethane insulation
  4. Primary fluid inlet.
  5. Internal stainless steel tank.
  6. Return connection (primary circuit)
  7. Outer steel tank containing the primary fluid.
  8. Manual air vent
  9. Domestic hot water outlet
  10. Polypropylene lid
  11. Outer jacket, thick polypropylene shell
  12. Polypropylene reinforced base


Capacity (total) 413 L
Heating surface DHW tank 3,24
Capacity (domestic hot water) 358 L
Connection - primary 6/4 F inches
Connection - DHW 6/4 M inches
Connection - re-circulation / safety valve 6/4 M inches
Primary flow (ΔT10K) do not use 6400 L/h
Pressure drop (primary - ΔT10K) 95 mbar
Max operating temperature (primary) 90 °C
Max operating pressure (DHW) 8,6 bar
Max operating pressure (primary) 4 bar
Weight (empty) 167 kg

Hot water performances

Peak flow at 40°C 1195 L/10’
Peak flow 1st hour at 40°C 3151 L/60’
Continuous flow at 40°C 2536 L/h
Peak flow 1st hour at 45°C 2608 L/60’
Continuous flow at 45°C 2058 L/h
Peak flow at 60°C 620 L/10’
Peak flow 1st hour at 60°C 1513 L/60’
Continuous flow at 60°C 1153 L/h
Pre-heating time from 10 to 80°C (Heat source: boiler) 24 min
Max absorbed heat (Heat source: boiler) 88 kW
Operating voltage 230 V
Max design pressure (DHW) 10 bar
A 2024 mm
B 1705 mm
C 250 mm
D 660 mm
Dim. - Height (with conn.) 2024 mm
Dim. - Height (w/o conn.) 1959 mm
Dim. - Width or Diameter (w/o conn.) 673 mm

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