MHI Series Horizontal Booster Pumps

Non-self-priming multistage pump

Application

WILO MHI series is applied to pumping potable water, cold and hot water in heating and water supply systems, condensate, water glycolic mixtures (up to 40% of glycol in the content), as well as other media containing neither mineral fat, nor abrasive or long fibrous impurities.

MHI booster pumps application: water supply and pressure boosting units, boiler feeding, industrial circulating systems, water cooling circuits, fire distinguishing systems, as well as washing and irrigation systems.

Performance Diagram

Marking

Example: MHI 205N-1/E/3-400-50-2
MHI -	Multistage horizontal high-pressure centrifugal pump
2 -	Volume flow in m³/h
05 -	Number of impellers
N -	IE2 motor
1 -	Material 1 = 1.4301 (AISI 304) 2 = 1.4404 (AISI 316L)
E -	Type of seal E = EPDM V = FKM (Viton)
3 -	1 = 1~ (single-phase AC) 3 = 3~ (three-phase AC)
400 -	Connection voltage in V
50 -	Frequency in Hz
2 -	Number of poles

MHI Booster Pumps

Model	Capacity, kW	Flow rate, m³/h	Head, m	Image
MHI 202	0.55	5	25
MHI 203	0.55	5	35
MHI 204	0.55	5	45
MHI 205	0.75	5	55
MHI 206	1.1	5	65
MHI 402	0.55	8	25
MHI 403	0.55	8	35
MHI 404	0.75	8	45
MHI 405	1.1	8	55
MHI 406	1.5	8	70
MHI 802	0.75	12	25
MHI 803	1.1	12	35
MHI 804	1.5	12	45
MHI 805	1.85	12	60
MHI 1602	1.5	25	25
MHI 1603	1.85	25	35
MHI 1604	2.5	25	45

Technical Data

	WILO MHI
	2...	4...	8...	16...
Media allowed to be pumped
Potable water and process water, water for heating system	yes
Condensate	yes
Water glycolic mixture (up to 40% of glycol, starting from 10% - motor capacity adjustment neededis required)	yes
Other low viscous liquids (containing neither abrasive, nor long fibrous impurities that damage the pump)	yes
Operational characteristics (at frequency 50 Hz)
Max. flow rate [m³/h]	5	8	12	25
Max. head [m]	70	70	60	47
Temperature of pumped medium [^оС]	from -15 to +110
Ambient temperature [^оС]	40
Process pressure [bar]	10
Inlet pressure [bar]	6
Max. frequency [r/min]	2950
Motor
Electric connections 1~[V/Hz] (allowable voltage deviation ±10%)	230/50 or 220/60
Electric connections 3~[V/Hz] (allowable voltage deviation ±10%)	230/50 ∆ or 220/60 ∆ 400/50 Y or 380/60 Y
Insulation class	F
Jamming	EN 61800-3
IP rating	IP 54
Connections
Diameter of connections at discharge side [Rp]	1	1	1¼	1½
Constructing materials
Impeller	1.4301/1.4404
Stage chamber	1.4301/1.4404
Pump housing	1.4301/1.4404
Shaft	1.4404
Mechanical seal	EPDM (EP 851)/Viton
Housing cover	1.4301/1.4404
Sliding mechanical seal	Graphite (Carbon)/Tungsten catch (SIC)
Forcing valve	1.4301/1.4404
Bearing	Tungsten catch
Pump foot	Aluminum

Explanatory note to inlet pressure:
Maximum inlet pressure is calculated in the following way: the maximum working pressure of the system minus the maximum pressure generated by the pump at Q = 0

Explanatory note to the materials used:
1.4301 steel corresponds to AISI 304, 1.4404 steel corresponds to AISI 316L.