Becker & Wolf 100L Horizontal Wall Mounted Heat Pump Water Heater R134a – BWHP100WMH134 – A+ Rated – WiFi – G3 Kit
100 Litres Horizontal Wall Mount R134a Refrigerant A+ Energy Rating WiFi Smart Control G3 Kit Included Becker & Wolf
The Becker & Wolf BWHP100WMH134 is a 100-litre heat pump water heater in a unique horizontal wall-mounted configuration — the only model in the Becker & Wolf range designed to lie on its side. This makes it the ideal solution for spaces where a tall vertical unit simply will not fit: low-ceilinged utility rooms, boiler cupboards, under-stairs spaces, and garage roof areas. Using R134a refrigerant, it achieves an A+ ErP energy rating and delivers hot water up to 75°C. The all-in-one design means no outdoor unit — compressor, fan, heat exchanger, and tank are integrated in one horizontal unit. WiFi connectivity via the Becker & Wolf app and a 2 kW backup electric heater ensure hot water availability year-round. Supplied complete with a G3 safety kit and potable expansion vessel.
ℹ️ Model: BWHP100WMH134 · Capacity: 100 L · Refrigerant: R134a · Installation: Wall Mounted — Horizontal · Key USP: Horizontal orientation for low-ceiling or confined spaces
🏠 When to choose the horizontal model: The BWHP100WMH134 is the right choice when you need 100L of heat pump hot water storage but the installation location has a ceiling height too low for a vertical unit (typically under ~1.6–1.7m clear height). Common applications: integrated loft conversions, boiler cupboards, garage ceiling installations, and plant rooms with roof beams.
Key Features
- ✓R134a refrigerant — established HFC refrigerant with proven reliability in heat pump water heaters; non-flammable and safe for indoor installation
- ✓All-in-one horizontal wall-mounted design — the unique horizontal orientation fits beneath low-ceilinged spaces such as boiler cupboards, under-stairs voids, and utility areas where vertical units cannot be installed
- ✓A+ Energy Efficiency rating under ErP Directive — significantly cheaper to run than a direct electric immersion heater
- ✓Max water temperature 75°C — suitable for Legionella control thermal disinfection cycles
- ✓Backup 2 kW electric immersion heater — integrated auxiliary element maintains hot water availability independently of ambient temperature
- ✓WiFi smart control — compatible with the Becker & Wolf app (iOS & Android); monitor and adjust remotely
- ✓Multiple operating modes — Heat Pump Only, Auto, Boost (electric only), Holiday mode, Timer schedules
- ✓Magnesium anode protection — protects the inner tank from corrosion; serviceable without draining the tank
- ✓Top inlet/top outlet connection — both water connections at the top; ideal for wall-mounted installation where pipe runs must be concealed within the wall or ceiling
- ✓IPX1 weather protection — suitable for damp indoor environments
- ✓Becker & Wolf App — iOS and Android; remote monitoring, scheduling, and fault alerts for customers and installers
- ✓Includes G3 kit and potable expansion vessel — complete safety group included; connects directly to mains water supply
- ✓Horizontal orientation — the defining feature of this model; lies horizontally on the wall, requiring only ~600mm clear height (vs ~1.3m+ for vertical units). Ideal for confined spaces where vertical installation is impossible
- ✓R134a vs R290 — why choose R134a? R134a is non-flammable, making it the preferred choice in installations where a flammable refrigerant (R290 is propane) would present a safety concern — for example, in areas with poor ventilation, near ignition sources, or in jurisdictions where R290 appliance installation has specific requirements
- ✓Space-saving: The horizontal form factor fits neatly in locations that would be wasted space for a vertical cylinder
- ✓Top water connections — both cold inlet and hot outlet at the top; ideally suited to horizontal installation where pipework runs vertically from the unit
Technical Specifications
| Specification | Value |
|---|---|
| Model Number | BWHP100WMH134 |
| Tank Capacity | 100 litres |
| Refrigerant | R134a — GWP 1,430 (HFC) |
| Energy Efficiency Class | A+ (ErP) |
| Max Water Temperature | 75°C |
| Aux. Electric Heater | 2 kW (boost/backup mode) |
| Default Water Temperature | 55°C (adjustable) |
| Power Supply | 220–240 V / 1-phase / 50 Hz |
| IP Rating | IPX1 |
| Orientation | Horizontal (wall-mounted) |
| WiFi Control | Yes — Becker & Wolf app (iOS & Android) |
| Installation Type | Wall Mounted — Horizontal |
| Suitable for | 2–3 persons / locations with height restrictions |
⚠️ The BWHP100WMH134 uses R134a refrigerant (GWP 1,430) rather than R290. While A+ rated and highly efficient, if minimising global warming potential is a priority, consider the R290 wall-mounted models (BWHP080WM290 or BWHP100WM290) which have a GWP of just 3. The horizontal model's primary advantage is its unique installation orientation for space-constrained locations.
What's Included
- ✓BWHP100WMH134 100L horizontal wall-mounted heat pump water heater unit
- ✓G3 safety group kit (pressure reducing valve, expansion relief valve, check valve, pressure gauge, tundish)
- ✓Potable expansion vessel (sized for 100L)
- ✓Magnesium anode (fitted inside tank)
- ✓Installation and user manual
- ✓Becker & Wolf WiFi module
Installation Notes
- ✓Installation by a qualified heating engineer is required. Refrigerant handling requires F-Gas / REFCOM certification
- ✓Horizontal wall mounting: The unit mounts horizontally on a structural wall; use the manufacturer's bracket and fixings rated to support the gross weight of the unit
- ✓Clearance: Ensure adequate air clearance around the unit — the fan draws in ambient air from the room; minimum clearances per the installation manual must be observed
- ✓No outdoor unit required — entirely indoor installation
- ✓Electrical: Single-phase 230V, 13A socket or fused spur with RCD protection
- ✓Water connections: Top inlet/outlet; fit the G3 safety group on cold supply; install potable expansion vessel on cold side
- ✓Condensate drain — the unit produces condensate during operation; plan a suitable drain point
Frequently Asked Questions
Why would I choose the horizontal model over the vertical wall-mounted units?
The BWHP100WMH134's horizontal orientation is its unique advantage. If your installation location has a ceiling height insufficient for a standard vertical heat pump (typically you need at least 1.3–1.5m clearance for vertical units), the horizontal model can fit in the same space with as little as ~600mm of height. Common examples: boiler cupboards, under-stairs areas, loft spaces with sloping ceilings, or above door frames in utility rooms.
Is R134a less efficient than R290?
At ambient temperatures above 20°C, R290 (propane) typically achieves around 10% higher COP than R134a in comparable systems. At 10°C ambient (cool UK conditions), studies suggest R134a and R290 perform similarly. In practice, both refrigerants deliver strong A+ rated performance and significant savings over direct electric heating. The primary reason to choose the horizontal R134a model is installation geometry, not efficiency.
Can the horizontal model be installed vertically?
No — the BWHP100WMH134 is specifically designed for horizontal installation. The internal components including the refrigerant circuit, tank, and mounting points are optimised for horizontal orientation. Installing it vertically would void the warranty and could damage the unit.
What is the recovery time for the 100L horizontal model?
In heat pump mode at 20°C ambient, the unit heats approximately 20–25 L/h (exact rate depends on final manufacturer specification). Heating 100L from 15°C to 55°C takes approximately 4–5 hours in heat pump mode. In Boost (electric only) mode with the 2kW immersion, recovery takes approximately 5.8 hours. For faster recovery at peak demand, Auto mode activates both heat pump and electric element simultaneously.
Does it come with a G3 safety kit?
Yes — the BWHP100WMH134 as sold by Quality Heating includes a complete G3 safety group and a compatible potable expansion vessel, ready for direct mains water connection.
What ambient temperature does the heat pump work at?
The heat pump operates in ambient air temperatures from –7°C to +43°C. Below about 5°C, COP reduces; the integrated 2 kW electric backup heater automatically activates at low temperatures to maintain the set water temperature. In practice, most UK installations operate efficiently throughout the year.
Does it need an outdoor unit?
No — this is a self-contained all-in-one unit. The heat pump compressor, heat exchanger, fan, and storage tank are all integrated in one unit. There is no separate outdoor unit and no refrigerant pipework to run between two units. The unit draws heat from the room air and can be installed entirely indoors, optionally ducted to draw or exhaust air through an external wall.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Becker & Wolf 100L Horizontal Wall Mounted Heat Pump Water Heater R134a – BWHP100WMH134 – A+ Rated – WiFi – G3 Kit
Becker & Wolf 100L Horizontal Wall Mounted Heat Pump Water Heater R134a – BWHP100WMH134 – A+ Rated – WiFi – G3 Kit
100 Litres Horizontal Wall Mount R134a Refrigerant A+ Energy Rating WiFi Smart Control G3 Kit Included Becker & Wolf
The Becker & Wolf BWHP100WMH134 is a 100-litre heat pump water heater in a unique horizontal wall-mounted configuration — the only model in the Becker & Wolf range designed to lie on its side. This makes it the ideal solution for spaces where a tall vertical unit simply will not fit: low-ceilinged utility rooms, boiler cupboards, under-stairs spaces, and garage roof areas. Using R134a refrigerant, it achieves an A+ ErP energy rating and delivers hot water up to 75°C. The all-in-one design means no outdoor unit — compressor, fan, heat exchanger, and tank are integrated in one horizontal unit. WiFi connectivity via the Becker & Wolf app and a 2 kW backup electric heater ensure hot water availability year-round. Supplied complete with a G3 safety kit and potable expansion vessel.
ℹ️ Model: BWHP100WMH134 · Capacity: 100 L · Refrigerant: R134a · Installation: Wall Mounted — Horizontal · Key USP: Horizontal orientation for low-ceiling or confined spaces
🏠 When to choose the horizontal model: The BWHP100WMH134 is the right choice when you need 100L of heat pump hot water storage but the installation location has a ceiling height too low for a vertical unit (typically under ~1.6–1.7m clear height). Common applications: integrated loft conversions, boiler cupboards, garage ceiling installations, and plant rooms with roof beams.
Key Features
- ✓R134a refrigerant — established HFC refrigerant with proven reliability in heat pump water heaters; non-flammable and safe for indoor installation
- ✓All-in-one horizontal wall-mounted design — the unique horizontal orientation fits beneath low-ceilinged spaces such as boiler cupboards, under-stairs voids, and utility areas where vertical units cannot be installed
- ✓A+ Energy Efficiency rating under ErP Directive — significantly cheaper to run than a direct electric immersion heater
- ✓Max water temperature 75°C — suitable for Legionella control thermal disinfection cycles
- ✓Backup 2 kW electric immersion heater — integrated auxiliary element maintains hot water availability independently of ambient temperature
- ✓WiFi smart control — compatible with the Becker & Wolf app (iOS & Android); monitor and adjust remotely
- ✓Multiple operating modes — Heat Pump Only, Auto, Boost (electric only), Holiday mode, Timer schedules
- ✓Magnesium anode protection — protects the inner tank from corrosion; serviceable without draining the tank
- ✓Top inlet/top outlet connection — both water connections at the top; ideal for wall-mounted installation where pipe runs must be concealed within the wall or ceiling
- ✓IPX1 weather protection — suitable for damp indoor environments
- ✓Becker & Wolf App — iOS and Android; remote monitoring, scheduling, and fault alerts for customers and installers
- ✓Includes G3 kit and potable expansion vessel — complete safety group included; connects directly to mains water supply
- ✓Horizontal orientation — the defining feature of this model; lies horizontally on the wall, requiring only ~600mm clear height (vs ~1.3m+ for vertical units). Ideal for confined spaces where vertical installation is impossible
- ✓R134a vs R290 — why choose R134a? R134a is non-flammable, making it the preferred choice in installations where a flammable refrigerant (R290 is propane) would present a safety concern — for example, in areas with poor ventilation, near ignition sources, or in jurisdictions where R290 appliance installation has specific requirements
- ✓Space-saving: The horizontal form factor fits neatly in locations that would be wasted space for a vertical cylinder
- ✓Top water connections — both cold inlet and hot outlet at the top; ideally suited to horizontal installation where pipework runs vertically from the unit
Technical Specifications
| Specification | Value |
|---|---|
| Model Number | BWHP100WMH134 |
| Tank Capacity | 100 litres |
| Refrigerant | R134a — GWP 1,430 (HFC) |
| Energy Efficiency Class | A+ (ErP) |
| Max Water Temperature | 75°C |
| Aux. Electric Heater | 2 kW (boost/backup mode) |
| Default Water Temperature | 55°C (adjustable) |
| Power Supply | 220–240 V / 1-phase / 50 Hz |
| IP Rating | IPX1 |
| Orientation | Horizontal (wall-mounted) |
| WiFi Control | Yes — Becker & Wolf app (iOS & Android) |
| Installation Type | Wall Mounted — Horizontal |
| Suitable for | 2–3 persons / locations with height restrictions |
⚠️ The BWHP100WMH134 uses R134a refrigerant (GWP 1,430) rather than R290. While A+ rated and highly efficient, if minimising global warming potential is a priority, consider the R290 wall-mounted models (BWHP080WM290 or BWHP100WM290) which have a GWP of just 3. The horizontal model's primary advantage is its unique installation orientation for space-constrained locations.
What's Included
- ✓BWHP100WMH134 100L horizontal wall-mounted heat pump water heater unit
- ✓G3 safety group kit (pressure reducing valve, expansion relief valve, check valve, pressure gauge, tundish)
- ✓Potable expansion vessel (sized for 100L)
- ✓Magnesium anode (fitted inside tank)
- ✓Installation and user manual
- ✓Becker & Wolf WiFi module
Installation Notes
- ✓Installation by a qualified heating engineer is required. Refrigerant handling requires F-Gas / REFCOM certification
- ✓Horizontal wall mounting: The unit mounts horizontally on a structural wall; use the manufacturer's bracket and fixings rated to support the gross weight of the unit
- ✓Clearance: Ensure adequate air clearance around the unit — the fan draws in ambient air from the room; minimum clearances per the installation manual must be observed
- ✓No outdoor unit required — entirely indoor installation
- ✓Electrical: Single-phase 230V, 13A socket or fused spur with RCD protection
- ✓Water connections: Top inlet/outlet; fit the G3 safety group on cold supply; install potable expansion vessel on cold side
- ✓Condensate drain — the unit produces condensate during operation; plan a suitable drain point
Frequently Asked Questions
Why would I choose the horizontal model over the vertical wall-mounted units?
The BWHP100WMH134's horizontal orientation is its unique advantage. If your installation location has a ceiling height insufficient for a standard vertical heat pump (typically you need at least 1.3–1.5m clearance for vertical units), the horizontal model can fit in the same space with as little as ~600mm of height. Common examples: boiler cupboards, under-stairs areas, loft spaces with sloping ceilings, or above door frames in utility rooms.
Is R134a less efficient than R290?
At ambient temperatures above 20°C, R290 (propane) typically achieves around 10% higher COP than R134a in comparable systems. At 10°C ambient (cool UK conditions), studies suggest R134a and R290 perform similarly. In practice, both refrigerants deliver strong A+ rated performance and significant savings over direct electric heating. The primary reason to choose the horizontal R134a model is installation geometry, not efficiency.
Can the horizontal model be installed vertically?
No — the BWHP100WMH134 is specifically designed for horizontal installation. The internal components including the refrigerant circuit, tank, and mounting points are optimised for horizontal orientation. Installing it vertically would void the warranty and could damage the unit.
What is the recovery time for the 100L horizontal model?
In heat pump mode at 20°C ambient, the unit heats approximately 20–25 L/h (exact rate depends on final manufacturer specification). Heating 100L from 15°C to 55°C takes approximately 4–5 hours in heat pump mode. In Boost (electric only) mode with the 2kW immersion, recovery takes approximately 5.8 hours. For faster recovery at peak demand, Auto mode activates both heat pump and electric element simultaneously.
Does it come with a G3 safety kit?
Yes — the BWHP100WMH134 as sold by Quality Heating includes a complete G3 safety group and a compatible potable expansion vessel, ready for direct mains water connection.
What ambient temperature does the heat pump work at?
The heat pump operates in ambient air temperatures from –7°C to +43°C. Below about 5°C, COP reduces; the integrated 2 kW electric backup heater automatically activates at low temperatures to maintain the set water temperature. In practice, most UK installations operate efficiently throughout the year.
Does it need an outdoor unit?
No — this is a self-contained all-in-one unit. The heat pump compressor, heat exchanger, fan, and storage tank are all integrated in one unit. There is no separate outdoor unit and no refrigerant pipework to run between two units. The unit draws heat from the room air and can be installed entirely indoors, optionally ducted to draw or exhaust air through an external wall.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
100 Litres Horizontal Wall Mount R134a Refrigerant A+ Energy Rating WiFi Smart Control G3 Kit Included Becker & Wolf
The Becker & Wolf BWHP100WMH134 is a 100-litre heat pump water heater in a unique horizontal wall-mounted configuration — the only model in the Becker & Wolf range designed to lie on its side. This makes it the ideal solution for spaces where a tall vertical unit simply will not fit: low-ceilinged utility rooms, boiler cupboards, under-stairs spaces, and garage roof areas. Using R134a refrigerant, it achieves an A+ ErP energy rating and delivers hot water up to 75°C. The all-in-one design means no outdoor unit — compressor, fan, heat exchanger, and tank are integrated in one horizontal unit. WiFi connectivity via the Becker & Wolf app and a 2 kW backup electric heater ensure hot water availability year-round. Supplied complete with a G3 safety kit and potable expansion vessel.
ℹ️ Model: BWHP100WMH134 · Capacity: 100 L · Refrigerant: R134a · Installation: Wall Mounted — Horizontal · Key USP: Horizontal orientation for low-ceiling or confined spaces
🏠 When to choose the horizontal model: The BWHP100WMH134 is the right choice when you need 100L of heat pump hot water storage but the installation location has a ceiling height too low for a vertical unit (typically under ~1.6–1.7m clear height). Common applications: integrated loft conversions, boiler cupboards, garage ceiling installations, and plant rooms with roof beams.
Key Features
- ✓R134a refrigerant — established HFC refrigerant with proven reliability in heat pump water heaters; non-flammable and safe for indoor installation
- ✓All-in-one horizontal wall-mounted design — the unique horizontal orientation fits beneath low-ceilinged spaces such as boiler cupboards, under-stairs voids, and utility areas where vertical units cannot be installed
- ✓A+ Energy Efficiency rating under ErP Directive — significantly cheaper to run than a direct electric immersion heater
- ✓Max water temperature 75°C — suitable for Legionella control thermal disinfection cycles
- ✓Backup 2 kW electric immersion heater — integrated auxiliary element maintains hot water availability independently of ambient temperature
- ✓WiFi smart control — compatible with the Becker & Wolf app (iOS & Android); monitor and adjust remotely
- ✓Multiple operating modes — Heat Pump Only, Auto, Boost (electric only), Holiday mode, Timer schedules
- ✓Magnesium anode protection — protects the inner tank from corrosion; serviceable without draining the tank
- ✓Top inlet/top outlet connection — both water connections at the top; ideal for wall-mounted installation where pipe runs must be concealed within the wall or ceiling
- ✓IPX1 weather protection — suitable for damp indoor environments
- ✓Becker & Wolf App — iOS and Android; remote monitoring, scheduling, and fault alerts for customers and installers
- ✓Includes G3 kit and potable expansion vessel — complete safety group included; connects directly to mains water supply
- ✓Horizontal orientation — the defining feature of this model; lies horizontally on the wall, requiring only ~600mm clear height (vs ~1.3m+ for vertical units). Ideal for confined spaces where vertical installation is impossible
- ✓R134a vs R290 — why choose R134a? R134a is non-flammable, making it the preferred choice in installations where a flammable refrigerant (R290 is propane) would present a safety concern — for example, in areas with poor ventilation, near ignition sources, or in jurisdictions where R290 appliance installation has specific requirements
- ✓Space-saving: The horizontal form factor fits neatly in locations that would be wasted space for a vertical cylinder
- ✓Top water connections — both cold inlet and hot outlet at the top; ideally suited to horizontal installation where pipework runs vertically from the unit
Technical Specifications
| Specification | Value |
|---|---|
| Model Number | BWHP100WMH134 |
| Tank Capacity | 100 litres |
| Refrigerant | R134a — GWP 1,430 (HFC) |
| Energy Efficiency Class | A+ (ErP) |
| Max Water Temperature | 75°C |
| Aux. Electric Heater | 2 kW (boost/backup mode) |
| Default Water Temperature | 55°C (adjustable) |
| Power Supply | 220–240 V / 1-phase / 50 Hz |
| IP Rating | IPX1 |
| Orientation | Horizontal (wall-mounted) |
| WiFi Control | Yes — Becker & Wolf app (iOS & Android) |
| Installation Type | Wall Mounted — Horizontal |
| Suitable for | 2–3 persons / locations with height restrictions |
⚠️ The BWHP100WMH134 uses R134a refrigerant (GWP 1,430) rather than R290. While A+ rated and highly efficient, if minimising global warming potential is a priority, consider the R290 wall-mounted models (BWHP080WM290 or BWHP100WM290) which have a GWP of just 3. The horizontal model's primary advantage is its unique installation orientation for space-constrained locations.
What's Included
- ✓BWHP100WMH134 100L horizontal wall-mounted heat pump water heater unit
- ✓G3 safety group kit (pressure reducing valve, expansion relief valve, check valve, pressure gauge, tundish)
- ✓Potable expansion vessel (sized for 100L)
- ✓Magnesium anode (fitted inside tank)
- ✓Installation and user manual
- ✓Becker & Wolf WiFi module
Installation Notes
- ✓Installation by a qualified heating engineer is required. Refrigerant handling requires F-Gas / REFCOM certification
- ✓Horizontal wall mounting: The unit mounts horizontally on a structural wall; use the manufacturer's bracket and fixings rated to support the gross weight of the unit
- ✓Clearance: Ensure adequate air clearance around the unit — the fan draws in ambient air from the room; minimum clearances per the installation manual must be observed
- ✓No outdoor unit required — entirely indoor installation
- ✓Electrical: Single-phase 230V, 13A socket or fused spur with RCD protection
- ✓Water connections: Top inlet/outlet; fit the G3 safety group on cold supply; install potable expansion vessel on cold side
- ✓Condensate drain — the unit produces condensate during operation; plan a suitable drain point
Frequently Asked Questions
Why would I choose the horizontal model over the vertical wall-mounted units?
The BWHP100WMH134's horizontal orientation is its unique advantage. If your installation location has a ceiling height insufficient for a standard vertical heat pump (typically you need at least 1.3–1.5m clearance for vertical units), the horizontal model can fit in the same space with as little as ~600mm of height. Common examples: boiler cupboards, under-stairs areas, loft spaces with sloping ceilings, or above door frames in utility rooms.
Is R134a less efficient than R290?
At ambient temperatures above 20°C, R290 (propane) typically achieves around 10% higher COP than R134a in comparable systems. At 10°C ambient (cool UK conditions), studies suggest R134a and R290 perform similarly. In practice, both refrigerants deliver strong A+ rated performance and significant savings over direct electric heating. The primary reason to choose the horizontal R134a model is installation geometry, not efficiency.
Can the horizontal model be installed vertically?
No — the BWHP100WMH134 is specifically designed for horizontal installation. The internal components including the refrigerant circuit, tank, and mounting points are optimised for horizontal orientation. Installing it vertically would void the warranty and could damage the unit.
What is the recovery time for the 100L horizontal model?
In heat pump mode at 20°C ambient, the unit heats approximately 20–25 L/h (exact rate depends on final manufacturer specification). Heating 100L from 15°C to 55°C takes approximately 4–5 hours in heat pump mode. In Boost (electric only) mode with the 2kW immersion, recovery takes approximately 5.8 hours. For faster recovery at peak demand, Auto mode activates both heat pump and electric element simultaneously.
Does it come with a G3 safety kit?
Yes — the BWHP100WMH134 as sold by Quality Heating includes a complete G3 safety group and a compatible potable expansion vessel, ready for direct mains water connection.
What ambient temperature does the heat pump work at?
The heat pump operates in ambient air temperatures from –7°C to +43°C. Below about 5°C, COP reduces; the integrated 2 kW electric backup heater automatically activates at low temperatures to maintain the set water temperature. In practice, most UK installations operate efficiently throughout the year.
Does it need an outdoor unit?
No — this is a self-contained all-in-one unit. The heat pump compressor, heat exchanger, fan, and storage tank are all integrated in one unit. There is no separate outdoor unit and no refrigerant pipework to run between two units. The unit draws heat from the room air and can be installed entirely indoors, optionally ducted to draw or exhaust air through an external wall.
