Hot Water Circulation Pump

The MECHLION HW glandless circulator series is a pump range for mainly hot water circulation (heating) and hot water services (tap water) applications.

MECHLION HW series residential and light commercial hot water circulator pumps constitute a complete range of 3-speed circulator pumps. The pumps can be used in both open and closed systems.

HW pumps are of the canned-rotor type, i.e. pump and motor form an integral unit without a shaft seal and with only two gaskets for sealing.

The bearings are lubricated by the pumped liquid. This pump has 130mm or 180mm port to port dimensions to be chosen.

Exploded View and parts

Rear Housing Cast iron/ Brass/ Stainless Steel
Impeller PES/ PP
Shield cover base Stainless Steel
Bearing Ceramic
Gasket Rubber
Thrust bearing Graphite/Carborundum
Rotor Silicon steel
Shaft Ceramic
Shield cover Stainless steel
Stator Silicon steel & Copper
Motor casing Die-cast Aluminium
Inner-hexagon screws Stainless steel
Air exhaust screw Brass
Nameplate Nylon
Terminal box Nylon

Pump Features & Application


  • Easy set-up and installation
  • High efficiency for low electricity bill
  • Robust construction for better reliability
  • Dry-run protection for longer product life
  • Quiet operation for better life quality
  • No sealing problem, No leakage


  • Solar water heating circulation
  • Floor heating circulation
  • Air condition circulation
  • Hot water boiler boosting
  • Heat pump circulation

Performance Curves

Technical Specification

Model HZ Phase Voltage Power Head Flow Current input/output Weight
HW(S)-25-40-130 50 Single 220V-240V 62.4/53.7/43.7 4 3.2 0.27 1-1/2″ 2.3
HW(S)-25-40-180 50 Single 220V-240V 62.4/53.7/43.7 4 3.2 0.27 1-1/2″ 2.6
HW(S)-25-60-130 50 Single 220V-240V 73.5/59.7/46.6 6 3.5 0.32 1-1/2″ 2.3
HW(S)-25-60-180 50 Single 220V-240V 73.5/59.7/46.6 6 3.5 0.32 1-1/2″ 2.6

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