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 Ireland

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

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Features and Benefits
Product Literature
Dimensions
Technical Specification

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 Reg4 Approval. BESA 2023 V4 approval. 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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*when evidence of commissioning supplied

Product Literature

Manuals

Specification Guides

Technical Specifications

BIM Files

CAD Files

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.

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.

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 Model	AquaHeat HI/HWI - 4/50	AquaHeat HI/HWI - 4/50	AquaHeat HI/HWI - 14/50	AquaHeat HI/HWI - 14/50	AquaHeat HI - 50	AquaHeat HI - 50	AquaHeat HD/HWI - 12/50	AquaHeat HD/HWI - 12/50
	with Heat Meter & Mercurius		with Heat Meter & Mercurius		with Heat Meter & Mercurius		with Heat Meter & Mercurius
Product Code	7867470	7867472	7867476	7867477	7867474	7867475	7892284	7892283
Net Weight (Dry) (kg)	27	26.5	27	26.7	30	30	10.5	10.5
Net Weight (Wet) (kg)	27.5	27	27.5	27.2	31.5	31.5	11	11
Gross Weight (packaged) (kg)	27	26.5	27	26.7	30	30	10.5	10.5
Height (packaged) (mm)	750	750	750	750	857	857	544	544
Width (packaged) (mm)	540	540	540	540	540	540	300	300
Depth (packaged) (mm)	260	260	260	260	260	260	250	250
Heat Loss in keep warm mode high temp (DH 70°C) (kWh / 24h)	0.95	0.95	0.95	0.95	-	-	0.61	0.61
Heat Loss in keep warm mode low temp (DH 55°C) (kWh / 24h)	0.91	0.91	0.91	0.91			0.69	0.69

Primary Side
Max operating pressure (bar)	16	16	16	16	16	16	6	6
Max operating temperature (˚C)	90	90	90	90	90	90	90	90
Maximum primary flow rate (DHW mode) (55 primary / 50 dhw (m3/h)	0.9	0.9	0.9	0.9	-	-	0.9	0.9
Maximum primary flow rate (space heating mode) (55 primary / 45/35 CH) (m3/h)	0.26	0.26	0.6	0.6	3	3	0.5	0.5
Maximum primary pressure differential (kPa)	600	600	600	600			600	600
Min primary pressure drop req. at Maximum primary flow rate (DHW Mode) (kPa)	16	16	16	16	-	-	16	16
Space Heating hydraulics
Max operating pressure (bar)	2.5	2.5	2.5	2.5	3	3	6	6
Max operating temperature (˚C)	85	85	85	85	85	85	90	90
Safety relief valve setting (bar)	3	3	3	3	3	3	N/A	N/A
Heating temperature setpoint (min - max) (˚C)	15 - 85	15 - 85	15 - 85	15 - 85	15 - 85	15 - 85	15 - 90	15 - 90
Heating temperature setpoint (default) (˚C)	45	45	45	45	45	45	55	55
Heating nominal pump head (kPa)	70	70	70	70	-	-	N/A	N/A
DHW hydraulics
Max operating pressure (bar)	10	10	10	10	-	-	10	10
Min cold water supply pressure (bar)	1	1	1	1	-	-	1	1
Hot water temperature setpoint (min-max) (˚C)	40-65	40-65	40-65	40-65	-	-	40 - 65	40 - 65
Hot water temperature setting (default) (˚C)	50	50	50	50	-	-	50	50
Electrical
Power supply (V / Hz)	230V ~50 Hz	230V ~50 Hz	230V ~50 Hz	230V ~50 Hz	230V ~50 Hz	230V ~50 Hz	230V ~50 Hz	230V ~50 Hz
Permanent live required (yes/no)	yes	yes	yes	yes	yes	yes	yes	yes
Power consumption (max space heating output) (W)	65	65	65	65	65	65	65	65
Power consumption (standby) (W)	3	3	3	3	3	3	3	3
Power consumption (max space heating output, with Mercurius) (W)	75	75	75	75	75	75	75	75
Power consumption (standby, with Mercurius) (W)	13	13	13	13	13	13	13	13
Minimum external fuse rating (A)	5	5	5	5	5	5	5	5
Internal fuse rating (A)	5	5	5	5	5	5	5	5
Connection Types / Sizes
Primary network flow	3/4 ISO G 228 male	3/4 ISO G 228 male	3/4 ISO G 228 male	3/4 ISO G 228 male	1 female	1 female	3/4 ISO G 228 male	3/4 ISO G 228 male
Primary network return	3/4 ISO G 228 male	3/4 ISO G 228 male	3/4 ISO G 228 male	3/4 ISO G 228 male	1 female	1 female	3/4 ISO G 228 male	3/4 ISO G 228 male
Space heating flow	3/4 ISO G 228 male	3/4 ISO G 228 male	3/4 ISO G 228 male	3/4 ISO G 228 male	1 female	1 female	3/4 ISO G 228 male	3/4 ISO G 228 male
Space heating return	3/4 ISO G 228 male	3/4 ISO G 228 male	3/4 ISO G 228 male	3/4 ISO G 228 male	1 female	1 female	3/4 ISO G 228 male	3/4 ISO G 228 male
Cold water feed	3/4 ISO G 228 male	3/4 ISO G 228 male	3/4 ISO G 228 male	3/4 ISO G 228 male	1 female	1 female	3/4 ISO G 228 male	3/4 ISO G 228 male
Domestic hot water flow	3/4 ISO G 228 male	3/4 ISO G 228 male	3/4 ISO G 228 male	3/4 ISO G 228 male	1 female	1 female	3/4 ISO G 228 male	3/4 ISO G 228 male
Space heating safety valve discharge (mm)	15	15	15	15	12	12	N/A	N/A

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.

Features and Benefits