Mainsboost Charger Pump -MJ3 Vessel Mounted

Mainsboost Charger

Mainsboost Charger MJ3 Pumps are used in conjunction with Mainsboost Steel Pressure Vessels, providing a direct on mains pump solution to offer increased water pressure and flow when the incoming mains cold water pressure does not meet minimum requirements.

Mainsboost Charger MJ3 pump units are mounted directly onto the Mainsboost vessel and options are available suitable for use with vertical or horizontally oriented vessels.

The Mainsboost Charger MJ3 will boost water pressure up to 3.5 bar and an optional sound attenuation cover is available if the system is to be installed in a location where noise levels are to be kept to a minimum.

All Mainsboost Charger MJ3 pumps feature an unique 'energy saving bypass' which means that the pump only runs when it needs to, they are also WRAS Approved and come with an industry leading 5 year guarantee as standard.

Mainsboost - performance on demand.

Technical Specification

Model + Product Code MJ3 VM (41712)
MJ3 HM (41729)
Guarantee 5 years
WRAS approval 1501305
System patent no. 2349908
Mounting MJ3 VM (Vertical vessel)
MJ3 HM (Horizontal vessel)
Pump type Peripheral
Mechanical seal EPDM / PTFE / Al. Oxide
Flexible hoses 2
Dry run protection  
Pump body Brass
Impeller Brass
Maximum head (closed valve) 4.3 bar
Maximum working pressure* 600 kPa (6 bar)
Maximum ambient air temperature 40 °C
Min / Max water temperature Min 4 °C / Max 35 °C
Pump connections G ¾ male
Flexible hoses
Connections 22 mm push-in x 22 mm push-in
x 240 mm long
Type Induction, auto-reset thermal trip
Duty rating Continuous
Power supply/phase/frequency 230 V a.c./ 1 / 50 Hz
Current (full load) 1.8 Amps
Power consumption 398 Watts
Fuse rating 3 Amps
Power cable (pre-wired) 1.5 metres
Enclosure protection IPX4
Pump Length** 200 mm
Pump Width** 203 mm
Pump Height (excluding hoses and brackets)** 216 mm

* The maximum pressure that can be applied to the pump under any installation conditions.

** See data sheet for overall system dimensions when the MJ3 pump is fitted to a vertical or horizontal Mainsboost pressure vessel.

Product Variants
Part no Description
41712 MJ3 VM (compatible with steel vessels only)
41729 MJ3 HM (compatible with 200 & 250 ltr horizontal steel vessels only)