Replacement Pump Head H4 25/6

𝗕𝗿𝗶𝘁𝗧𝗵𝗲𝗿𝗺 𝗛𝟰 𝗥𝗲𝗽𝗹𝗮𝗰𝗲𝗺𝗲𝗻𝘁 𝗣𝘂𝗺𝗽 𝗛𝗲𝗮𝗱

𝗕𝗲𝘀𝘁𝘀𝗲𝗹𝗹𝗲𝗿

The clockwise version of the H3. Same job, same fitting time, for boilers with a Wilo type pump.

𝗨𝘀𝗲 𝗶𝘁 𝗳𝗼𝗿: combi boilers fitted in the UK since 2015, where the pump motor has failed but the body and pipework are sound · boilers whose old head is a PWM type with a clockwise rotor arrow · smart home, underfloor, solar and heat pump systems, because the same PWM input lets a third party controller drive it · landlord and social housing repairs in one visit, often without draining the system

𝗥𝗶𝗴𝗵𝘁 𝗳𝗼𝗿 𝘆𝗼𝘂 𝗶𝗳

• Your boiler pump has failed but the body and pipework are sound

• The rotor arrow on the old motor points clockwise

• The old head is a Wilo Yonos Para or Para INT MSL

𝗖𝗵𝗲𝗰𝗸 𝘁𝗵𝗿𝗲𝗲 𝘁𝗵𝗶𝗻𝗴𝘀 𝗯𝗲𝗳𝗼𝗿𝗲 𝘆𝗼𝘂 𝗼𝗿𝗱𝗲𝗿

𝗥𝗼𝘁𝗮𝘁𝗶𝗼𝗻. The arrow on the old pump nameplate. Clockwise is H4. Anticlockwise is H3.

𝗛𝗲𝗮𝗱. Also on the nameplate, in metres. The H4 comes in 4 m, 6 m and 8 m.

𝗖𝗼𝗻𝗻𝗲𝗰𝘁𝗶𝗼𝗻. 20 = 1", 25 = 1 1/2", 32 = 2".

𝗤𝘂𝗶𝗰𝗸 𝗳𝗮𝗰𝘁𝘀

Head 4, 6 or 8 m · Power 3 to 65 W depending on model · Max pressure 10 bar · IP44 · Class F insulation · Nine models · 6 year guarantee when you register the pump

𝗛𝗼𝘄 𝗶𝘁 𝗿𝘂𝗻𝘀

The boiler controls the head over PWM, a low voltage signal from the boiler's own board through the supplied cable. Run without PWM, the head offers AUTO, constant pressure, proportional pressure and three fixed speeds. Eleven programs in total.

𝗚𝗼𝗼𝗱 𝘁𝗼 𝗸𝗻𝗼𝘄

A typical head swap takes 10 to 15 minutes. Error codes show on the display if something is wrong. Electrical and thermal protection is built in. There is also a forced ventilation mode at the press of a button, which clears trapped air on awkward systems.

𝗥𝗲𝗽𝗹𝗮𝗰𝗲𝘀: Wilo Yonos Para and Para INT MSL and more.

𝗜𝗻 𝘁𝗵𝗲 𝗯𝗼𝘅: head, universal bolts, high temperature gasket, 0.7 m cable, PWM cable set at no charge, Wilo power and PWM adaptors, fastening screws, datasheet, in a sturdy box.

Figures are from the BritTherm datasheet for each model. Check the datasheet and the fitting instructions before you order, and have the pump fitted by a competent person. Guarantee subject to registration and the guarantee terms.

• Set of nuts
• 1.3m cable with a UK plug
• Datasheet
• Packaged in sturdy box
• Free of charge PWM Set of Cables