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Stuart Pressurisation Unit SPU 135 MIDI

Digital Pressurisation Unit

Suitable for maintaining pressure in large domestic and commercial sealed heating systems, chilled water systems, refrigeration units and industrial cooling systems. STUART SPU MIDI units feature continuously rated brass peripheral pumps, are exceptionally easy to install and commission and are suitable for either floor or wall mounting.


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BIM-OBJECT 2 Year Warranty UKCA-CE
Stuart Pressurisation Unit SPU 135 MIDI
Key Features
  • Suitable for sealed systems of up to 300,000 litres
  • Single (Duty) pump option
  • 3.5 bar cold fill pressure
Technical Specification
Product Code 46721
Warranty 2 years
Approvals UKCE / CA
System capacity Up to 300,000 litres
Mounting Wall or floor mount
Pump control system
Intelligent control interface
System fill mode
Dry run protection
Typical noise 60 dB(A)
Break tank Polyethylene
Front cover Acrylic capped ABS
Maximum fill pressure 3.5 bar / 350 kPa
Maximum flow 17 l/min
Maximum inlet pressure - tank fill valve 7 bar / 700 kPa
Maximum working pressure 6 bar
Ambient air temperature Min 4 oC / Max 40 oC
Relative humidity 95 % non-condensing
Min./Max. water temperature Min 4 oC / Max 23 oC
Water tank
Usable water capacity 8 litres
Inlet valve and fill rate Torbeck (side entry) 12 l/min
Fluid category CAT 5 (type AB air gap with weir)
Cold water inlet 15 mm compression x 600 mm flexible hose
Cold water outlet 15 mm compression x 600 mm flexible hose
Overflow G ¾ (19 - 23 mm diameter pipe compression fitting)
Number of pumps 1
Pump mode Duty
Pump type Peripheral
Motor type Induction, auto-reset thermal trip
Duty rating Continuous (S1)
Pump head and impeller Brass
Power supply (Vac/Ph/Hz) 230 V a.c. / 1 / 50 Hz
Power consumption - P1 380 Watts
Current - full load 1.7 Amps
Fuse rating 5 Amps
Power cable length 1.5 metres (pre-wired)
Alarm output Multiple
Enclosure protection IPX4
Width 415 mm
Depth 270 mm
Height 504 mm
Weight - including fittings 13.4 Kg
Weight - filled 23.4 Kg
GTIN 13 DIGIT 5050400467212