2. Baxi AquaHeat HIUs

Commercial Solutions

Heat Interface Units

For homes fed with heat from a heat network, the Baxi AquaHeat HI/HWI (Heating Indirect/Hot Water Indirect) is the answer to your apartment’s heating and hot water requirements.


The Baxi AquaHeat HD/HWI (Heating Direct/Hot Water Indirect) provides an alternative highly efficient, low cost solution and the Baxi AquaHeat HI (Heating Indirect) is perfectly suited to supply heat to communal and commercial premises in your development.

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Baxi AquaHeat HI/HWI (Heating Indirect/Hot Water Indirect) Heat Interface Units - Baxi Commercial
Baxi Heat Interface Units - Baxi AquaHeat HI/HWI (Heating Indirect/Hot Water Indirect) - Baxi Commercial

Features and Benefits

Multiple outputs

Range of heating outputs from 4kW to 60kW and domestic hot water outputs from 18kW to 57kW.

    Easy installation

    Optional first fix rail with in-built filling loop and stand-off bracket to allow for installation with various primary and tertiary pipework. Pre-wired with heat meter and Mercurius remote monitoring module.

      Highly efficient

      Ultra-fast acting, fully modulating PICV perfectly matches energy supply to instantaneous demand and high performance insulation providing very low heat losses.

        Features and Benefits

        Feature
        Feature
        Feature
        Feature
        Feature

        BESA 2023 V3 accredited

        High performing Indirect HIU with 8 best practice passes. The first BESA 2023 certified Direct HIU with best practice Heat Loss performance.
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          Product Literature

          Installation & Service Manuals

          Installation & Service Manuals

          Product Documentation

          No documentation available.

          Specification Guides

          Specification Guides

          Product Documentation

          No documentation available.

          Data Sheets

          Data Sheets

          Product Documentation

          No documentation available.

          Energy Labels

          Energy Labels

          Product Documentation

          No documentation available.

          Product Fiche

          Product Fiche

          Product Documentation

          No documentation available.

          CAD

          CAD

          Product Documentation

          No documentation available.

          Baxi AquaHeat HIU - Heat Interface Unit Dimensions

          AquaHeat HI

          Dimensions

          A: HIU width = 540mm 

          B: HIU height = 857mm

          C: HIU depth = 260mm

          D: Side Clearance = 30mm

          E: Upper Clearance =100mm

          F: Lower Clearance = 30mm

          G: Front Clearance (in operation) = 200mm 

           

          Service clearances shown here are the minimum

          recommended dimensions. Greater clearance will 

          aid installation and maintenance.      

          Baxi AquaHeat HI/HWI Heat Interface Unit Dimensions

          AquaHeat HI/HWI

          Dimensions

          A: HIU width = 540mm

          B: HIU height = 750mm

          C: HIU depth = 260mm

          D: Side Clearance = 30mm

          E: Upper Clearance = 100mm

          F: Lower Clearance = 30mm

          G: Front Clearance (in operation) = 200mm 

           

          Service clearances shown here are the minimum

          recommended dimensions. Greater clearance will 

          aid installation and maintenance.      

          Baxi aquaheat HDHQI dimensions

          AquaHeat HD/HWI

          Dimensions

          A: HIU width = 300mm

          B: HIU height = 544mm

          C: HIU depth = 250mm

          D: Side Clearance = 30mm

          E: Upper Clearance = 30mm

          F: Lower Clearance = 100mm

          G: Front Clearance (in operation) = 200mm

           

          Service clearances shown here are the minimum 
          recommended dimensions. Greater clearance will 
          aid installation and maintenance.

          Technical Specification 

          Product ModelAquaHeat HI/HWI - 4/50AquaHeat HI/HWI - 4/50AquaHeat HI/HWI - 14/50AquaHeat HI/HWI - 14/50AquaHeat HI - 50AquaHeat HI - 50AquaHeat HD/HWI - 12/50AquaHeat HD/HWI - 12/50
          with Heat Meter & Mercuriuswith Heat Meter & Mercuriuswith Heat Meter & Mercuriuswith Heat Meter & Mercurius
          Product Code78674707867472786747678674777867474786747578922847892283
          Net Weight (Dry) (kg)2726.52726.7303010.510.5
          Net Weight (Wet) (kg)27.52727.527.231.531.51111
          Gross Weight (packaged) (kg)2726.52726.7303010.510.5
          Height (packaged) (mm)750750750750857857544544
          Width (packaged) (mm)540540540540540540300300
          Depth (packaged) (mm)260260260260260260250250
          Heat Loss in keep warm mode high temp (DH 70°C) (kWh / 24h)0.950.950.950.95--0.610.61
          Heat Loss in keep warm mode low temp (DH 55°C) (kWh / 24h)0.910.910.910.910.690.69
          Primary Side
          Max operating pressure (bar)16161616161666
          Max operating temperature (˚C)9090909090909090
          Maximum primary flow rate (DHW mode) (55 primary / 50 dhw (m3/h)0.90.90.90.9--0.90.9
          Maximum primary flow rate (space heating mode) (55 primary / 45/35 CH) (m3/h)0.260.260.60.6330.50.5
          Maximum primary pressure differential (kPa)600600600600600600
          Min primary pressure drop req. at Maximum primary flow rate (DHW Mode) (kPa)16161616--1616
          Space Heating hydraulics
          Max operating pressure (bar)2.52.52.52.53366
          Max operating temperature (˚C)8585858585859090
          Safety relief valve setting (bar)333333N/AN/A
          Heating temperature setpoint (min - max) (˚C)15 - 8515 - 8515 - 8515 - 8515 - 8515 - 8515 - 9015 - 90
          Heating temperature setpoint (default) (˚C)4545454545455555
          Heating nominal pump head (kPa)70707070--N/AN/A
          DHW hydraulics
          Max operating pressure (bar)10101010--1010
          Min cold water supply pressure (bar)1111--11
          Hot water temperature setpoint (min-max) (˚C)40-6540-6540-6540-65--40 - 6540 - 65
          Hot water temperature setting (default) (˚C)50505050--5050
          Electrical
          Power supply (V / Hz)230V ~50 Hz230V ~50 Hz230V ~50 Hz230V ~50 Hz230V ~50 Hz230V ~50 Hz230V ~50 Hz230V ~50 Hz
          Permanent live required (yes/no)yesyesyesyesyesyesyesyes
          Power consumption (max space heating output) (W)6565656565656565
          Power consumption (standby) (W)33333333
          Power consumption (max space heating output, with Mercurius) (W)7575757575757575
          Power consumption (standby, with Mercurius) (W)1313131313131313
          Minimum external fuse rating (A)55555555
          Internal fuse rating (A)55555555
          Connection Types / Sizes
          Primary network flow3/4 ISO G 228 male3/4 ISO G 228 male3/4 ISO G 228 male3/4 ISO G 228 male1 female1 female3/4 ISO G 228 male3/4 ISO G 228 male
          Primary network return3/4 ISO G 228 male3/4 ISO G 228 male3/4 ISO G 228 male3/4 ISO G 228 male1 female1 female3/4 ISO G 228 male3/4 ISO G 228 male
          Space heating flow3/4 ISO G 228 male3/4 ISO G 228 male3/4 ISO G 228 male3/4 ISO G 228 male1 female1 female3/4 ISO G 228 male3/4 ISO G 228 male
          Space heating return3/4 ISO G 228 male3/4 ISO G 228 male3/4 ISO G 228 male3/4 ISO G 228 male1 female1 female3/4 ISO G 228 male3/4 ISO G 228 male
          Cold water feed3/4 ISO G 228 male3/4 ISO G 228 male3/4 ISO G 228 male3/4 ISO G 228 male1 female1 female3/4 ISO G 228 male3/4 ISO G 228 male
          Domestic hot water flow3/4 ISO G 228 male3/4 ISO G 228 male3/4 ISO G 228 male3/4 ISO G 228 male1 female1 female3/4 ISO G 228 male3/4 ISO G 228 male
          Space heating safety valve discharge (mm)151515151212N/AN/A

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