Wilo PEXO Series – Compact Booster Pumps for Hot & Cold Water: 9 Models, Parameters & Selection (EN)

Q: What material is the Wilo PEXO pump made of – is there a stainless version?

According to this datasheet, every PEXO type has a grey cast iron pump housing and a PPO / PS-GF30 impeller. The document does not list a stainless-steel (e.g. 316) version of these models.

Q: What are the connection sizes and maximum pressure of the PEXO series?

All 9 models share a maximum operating pressure of PN 5 bar. Pump connections are G 1 for PEXO 4-16, 5-22, 6-26, 7-30; G 1¼ for PEXO 12-7, 14-12; G 1½ for PEXO 16-16, 18-24; and DN 40 for PEXO 22-30 (article numbers 9277756–9277763).

Overview: What is the Wilo PEXO series

 At a glance: The Wilo PEXO series is a range of compact, low-noise
 booster pumps for hot and cold water boosting and transfer. The range comprises
 9 models – PEXO 4-16, 5-22, 6-26, 7-30, 12-7, 14-12, 16-16, 18-24 and 22-30 –
 with rated motor power from 0.2 kW to 1.8 kW, pump connections from G 1 to DN 40,
 and a maximum operating pressure of PN 5 bar. All types share a grey cast iron pump
 housing and a PPO / PS-GF30 impeller. Per the datasheet, the sales availability date
 for the series is 2026-01-05. (All data below is taken verbatim from the Wilo product
 datasheet; fields the datasheet does not list – e.g. EAN, number of stages, head/flow duty values, gross
 weight, supply voltage, MEI, shaft-seal type and drinking-water certifications – are intentionally omitted,
 not estimated.)
 

Models in range

Rated power P₂

0.2–1.8 kW

Max. operating press.

PN 5 bar

Pump connection

G 1 – DN 40

Housing material

Grey cast iron

Impeller material

PPO / PS-GF30

Model selection table (Model · Article number · Connection · PN)

Model	Article number	Pump connection	Max. operating pressure PN
PEXO 4-16	9277756	G 1	5 bar
PEXO 5-22	9277757	G 1	5 bar
PEXO 6-26	9282396	G 1	5 bar
PEXO 7-30	9277758	G 1	5 bar
PEXO 12-7	9277759	G 1¼	5 bar
PEXO 14-12	9277760	G 1¼	5 bar
PEXO 16-16	9277761	G 1½	5 bar
PEXO 18-24	9277762	G 1½	5 bar
PEXO 22-30	9277763	DN 40	5 bar

All 9 models share the same maximum operating pressure of PN 5 bar. Connection sizes step up from G 1 (smaller types) to G 1¼, G 1½ and DN 40 (larger types) as flow capacity increases.

Series technical data (from the datasheet's general technical section)

Fluid temperature: not below 0 °C and not above +90 °C (the individual data sheets of PEXO 4-16 … 16-16 state 5…95 °C; PEXO 18-24 and 22-30 state 0…90 °C – see the detailed table below).
Fluid pH value: 6.5 – 8.5.
Solids content: max. 0.1 % by volume; particle size max. 0.2 mm.
Ambient temperature: 0 °C to 40 °C.
Installation altitude: below 1000 m.
Relative humidity: below 90 %.

Note on fluid-temperature ranges

The datasheet's general "Technical data" section specifies a fluid temperature of 0… +90 °C. The individual type data sheets, however, list slightly different limits: PEXO 4-16, 5-22, 6-26, 7-30, 12-7, 14-12 and 16-16 are specified with 5…95 °C, whereas the larger PEXO 18-24 and 22-30 are specified with 0…90 °C. Both figures are reproduced verbatim from the datasheet; for a given project, apply the limit stated for that specific type.

Detailed parameters – all 9 models

Model	Article no.	P₂	Rated current	Rated speed	Insul. class	Prot. class	Motor protection	Eff. class	Housing	Impeller	Net weight	Fluid temp.	Conn.
PEXO 4-16	9277756	0.2 kW (200 W)	1.06	2850	F	IP44	PTO	GB3	Grey cast iron	PPO / PS-GF30	9.5	5…95 °C	G 1
PEXO 5-22	9277757	0.3 kW (300 W)	2.04	2835	F	IP44	PTO	GB3	Grey cast iron	PPO / PS-GF30	10.5	5…95 °C	G 1
PEXO 6-26	9282396	0.45 kW (450 W)	2.85	2850	F	IP44	PTO	GB3	Grey cast iron	PPO / PS-GF30	10.5	5…95 °C	G 1
PEXO 7-30	9277758	0.6 kW (600 W)	3.84	2805	F	IP44	PTO	GB3	Grey cast iron	PPO / PS-GF30	9	5…95 °C	G 1
PEXO 12-7	9277759	0.2 kW (200 W)	1.06	2850	F	IP44	PTO	GB3	Grey cast iron	PPO / PS-GF30	11	5…95 °C	G 1¼
PEXO 14-12	9277760	0.35 kW (350 W)	2.36	2830	F	IP44	PTO	GB3	Grey cast iron	PPO / PS-GF30	12.5	5…95 °C	G 1¼
PEXO 16-16	9277761	0.6 kW (600 W)	3.84	2805	F	IP44	PTO	GB3	Grey cast iron	PPO / PS-GF30	14	5…95 °C	G 1½
PEXO 18-24	9277762	1.2 kW (1200 W)	2.61	2855	F	IP55	No (none)	IE3	Grey cast iron	PPO / PS-GF30	18	0…90 °C	G 1½
PEXO 22-30	9277763	1.8 kW (1800 W)	3.78	2860	F	IP55	No (none)	IE3	Grey cast iron	PPO / PS-GF30	20.5	0…90 °C	DN 40

Rated current in A; rated speed in 1/min; net weight in kg; fluid temperature as specified per type. Efficiency class: GB3 for PEXO 4-16 … 16-16, IE3 for PEXO 18-24 and 22-30 (per the datasheet tender text). Motor protection: PTO (automatic motor protection) for PEXO 4-16 … 16-16; no motor protection for PEXO 18-24 and 22-30.

Materials & motor protection

Pump housing: Grey cast iron (all 9 models).
Impeller: PPO / PS-GF30 (all 9 models).
Motor protection: PEXO 4-16, 5-22, 6-26, 7-30, 12-7, 14-12 and 16-16 are equipped with PTO – the stator winding over-temperature protection that automatically stops the pump and restarts it after cooling. PEXO 18-24 and 22-30 have no built-in motor protection.
Protection class: IP44 for PEXO 4-16 … 16-16; IP55 for PEXO 18-24 and 22-30.
Insulation class: F for all 9 models.

Material note (no stainless version in this datasheet)

This Wilo PEXO datasheet specifies a grey cast iron housing and a PPO / PS-GF30 impeller for every listed type. It does not list a stainless-steel (e.g. 316) variant of these PEXO models; do not assume one exists from this document.

Applications

Domestic & building water boosting: pressure increase for cold and hot potable-water systems within the stated temperature and PN 5 bar limits.
Hot & cold water transfer: circulation and transfer of clean water in residential and light commercial buildings.
General clean-water duties: where a compact, low-noise booster is required and the fluid stays within pH 6.5–8.5, solids ≤ 0.1 % (≤ 0.2 mm), ambient 0…40 °C.

FAQ

What is the difference between the smaller PEXO types (4-16 … 16-16) and the larger PEXO 18-24 / 22-30?

Beyond power and connection size, the larger types differ on three points per the datasheet: protection class IP55 (vs IP44), no built-in motor protection (the smaller types use PTO over-temperature protection), and an IE3 efficiency class (vs GB3). Their specified fluid temperature is also 0…90 °C (vs 5…95 °C for the smaller types).

What material is the Wilo PEXO pump made of – is there a stainless version?

According to this datasheet, every PEXO type has a grey cast iron pump housing and a PPO / PS-GF30 impeller. The document does not list a stainless-steel (e.g. 316) version of these models.

What are the connection sizes and maximum pressure of the PEXO series?

All 9 models share a maximum operating pressure of PN 5 bar. Pump connections are G 1 for PEXO 4-16, 5-22, 6-26, 7-30; G 1¼ for PEXO 12-7, 14-12; G 1½ for PEXO 16-16, 18-24; and DN 40 for PEXO 22-30 (article numbers 9277756–9277763).

What fluid conditions are required for the PEXO series?

Per the datasheet's general technical data: fluid temperature 0… +90 °C (type-specific limits noted above), pH 6.5–8.5, solids ≤ 0.1 % by volume with particle size ≤ 0.2 mm, ambient temperature 0…40 °C, installation altitude below 1000 m, and relative humidity below 90 %.

Source

Data source

All parameters on this page are taken verbatim from the Wilo official product datasheet wilo-datasheet_cn_en_pexo_id9828.pdf (article numbers 9277756–9277763; sales availability 2026-01-05). Fields the datasheet does not state (EAN, number of stages, head/flow duty values, gross weight, supply voltage, MEI, shaft-seal type and drinking-water certifications) are not listed here and are not estimated.

Wilo PEXO Series – Compact Booster Pumps for Hot & Cold Water