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.

        Remote monitoring and control

        Mercurius platform for remote monitoring to reduce site on time and giving visibility of errors to improve first-time fix rates.

          Reliable

          Water Regulation WRAS and Reg4 approved. BESA 2023 V3 compliant in preparation for HNTAS market regulation. Covered with a 5-year parts and labour warranty.*

            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

              Specification Guides

              Specification Guides

              Product Documentation

              No documentation available.

              Technical Specifications

              Technical Specifications

              Product Documentation

              No documentation available.

              BIM Files

              BIM Files

              Product Documentation

              No documentation available.

              Reports

              Reports

              Product Documentation

              No documentation available.

              TM65

              Sheet Title

              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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