How to Replace a Stuart Turner Monsoon 1.5 bar Twin (UK)
Fit a Stuart Turner Monsoon 1.5 bar Twin pump on a UK heating or boosted DHW system. Face-to-face, orientation, bleed sequence.
The pump
Stuart Turner Monsoon 1.5 bar Twin — confirm 130 mm or 180 mm face-to-face, and whether your system is single-phase 230 V or low-voltage.
Isolate
Turn off the boiler and 230 V spur. Close both pump gate valves. Have a shallow tray ready — approx 500 mL will spill.
Fit
Undo the pump unions, transfer the power lead terminating L/N/E in the correct order into the Stuart Turner Monsoon 1.5 bar Twin terminal box. Orient the pump head so the shaft is horizontal. Open valves, bleed via the centre screw until water flows clear.
Set the Stuart Turner Monsoon 1.5 bar Twin to the correct speed or auto-adapt curve per the OEM installer sheet.
Frequently asked questions
- Speed setting for Monsoon 1.5 bar Twin?
- Most modern UK homes: setting II on a fixed-speed Stuart Turner; auto-adapt on Stuart Turner A-rated pumps.
- Do I need to power-flush after fitting?
- Best practice — but at minimum add 500 mL Fernox F1 or Sentinel X100 and fit a magnetic filter.
- Is the Stuart Turner Monsoon 1.5 bar Twin ErP compliant?
- Yes — all current UK-sold A-rated pumps meet the ErP <180 W directive.
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