14kW Ecodan R32 3Ph Mono ASHP Outdoor Unit Coastal Zubadan — PUZ-HWM140YAA-BS

Description

The Mitsubishi Ecodan PUZ-HWM140YAA-BS is the three-phase, coastal-protection version of Mitsubishi's 14 kW R32 Zubadan monobloc air source heat pump — built on the Zubadan chassis with flash injection compressor technology for genuinely cold-climate performance. It maintains full output at low ambient temperatures and operates down to -28°C, with a three-phase electrical supply and enhanced corrosion resistance for coastal installations. Compatible with 210L, 250L and 300L Ecodan cylinders. This listing is the outdoor unit only.

14 kW

Heating output

R32

Refrigerant

SCOP 4.48

35°C seasonal efficiency

Zubadan

Cold-climate chassis

3-Phase

380-415V supply

-28°C

Guaranteed operation

BUS grant eligible

Eligible for the UK Boiler Upgrade Scheme grant when installed by an MCS-certified installer in an eligible property. The grant is paid directly to your installer and discounted from your quote.

-BS coastal protection

The -BS suffix denotes Mitsubishi's coastal-protection specification: enhanced corrosion-resistant casing treatment designed for installations exposed to salt-laden air near the sea. Functionally identical to the standard unit in output, efficiency and control compatibility — choose -BS specifically for coastal or otherwise corrosive environments.

Zubadan chassis — built for cold-climate demand

This model uses Mitsubishi's Zubadan chassis with flash injection compressor technology — engineered to sustain output at very low ambient temperatures and higher heat loss properties. Guaranteed operating range extends to -28°C, with full heating capacity maintained even at -7°C.

MCS-certified installer required

To claim the BUS grant and validate full Mitsubishi manufacturer warranty, this heat pump must be installed and commissioned by an MCS-certified heat pump installer.

Property fit

The 14 kW Ecodan typically suits: large family homes, lightly-insulated farmhouses, or properties with high domestic hot water demand needing Zubadan cold-climate performance and a three-phase electrical supply. Sizing should always follow a calculated heat loss assessment.

Key features

R32 refrigerant

Lower GWP than legacy R410A units, with a sealed factory-charged circuit — no on-site F-Gas brazing required at install.

True monobloc

All refrigerant work happens inside the outdoor unit at the factory. The installer only connects water pipes indoors, reducing install time and risk.

Coastal corrosion protection

The -BS casing treatment is specifically designed to resist salt-air corrosion — extending outdoor unit lifespan in coastal and other harsh environments.

MELCloud enabled

Built-in MELCloud connectivity for remote control, monitoring, maintenance and technical support — no separate Wi-Fi module required to get started.

Ultra-quiet operation

Engineered for low sound levels suited to boundary-sensitive sites — see the sound pressure and power figures in the specification table for this exact model.

UK manufacturer warranty

Backed by Mitsubishi's UK warranty when commissioned by a Mitsubishi-approved engineer. Warranty registration documentation is supplied in the box.

Technical specification

Model code	PUZ-HWM140YAA-BS
Quality Heating SKU	MITS-499283
Rated heating output	14 kW
Chassis	Zubadan (flash injection)
Refrigerant	R32 (GWP 675)
Refrigerant charge	3.3 kg
Heating capacity (A7/W35)	14 kW, COP 4.46
Heating capacity (A2/W35)	14 kW, COP 3.15
Heating capacity (A-7/W35)	14 kW, COP 2.45
Cooling capacity (A35/W7)	10 kW
ErP rating — 35°C flow	A+++, SCOP 4.48
ErP rating — 55°C flow	A++, SCOP 3.35
Guaranteed operating range	-28°C to +35°C ambient
Electrical supply	380-415V, 50Hz, three phase
Maximum current	13 A
Fuse rating	16 A
Sound pressure level at 1m	53 dB(A)
Sound power level	67 dB(A)
Water flow rate	40 L/min
Water pressure drop	1.20 kPa
Water pipe connections	28 mm
Dimensions (W × D × H)	1020 × 330 (+30mm grille) × 1350 mm
Weight	143 kg
Coastal protection	Yes (-BS specification)
Compatible control platform	Mitsubishi FTC7
Compatible cylinder sizes	210L, 250L, 300L Ecodan cylinders
Smart connectivity	MELCloud enabled (built in)
Cascade capability	Up to 6 units for larger applications
BUS grant eligibility	Yes, when MCS-installed

What's in the box

• Mitsubishi Ecodan R32 outdoor monobloc unit (PUZ-HWM140YAA-BS)
• Manufacturer installation and commissioning documentation
• Mitsubishi UK warranty registration card

What you'll also need (sold separately)

• FTC7 indoor controller (PAC-IF082B-E) or a pre-plumbed FTC7 cylinder (210L, 250L or 300L)
• Outdoor unit wall bracket or floor stand
• Anti-freeze valves on primary flow and return
• Magnetic system filter on the primary return
• Insulated flexible primary hoses and isolation valves
• Three-phase electrical isolator and consumer unit feed

Frequently Asked Questions

What does the -BS suffix mean?

-BS denotes Mitsubishi's coastal protection specification — an enhanced corrosion-resistant casing treatment for the outdoor unit. Output, efficiency and control compatibility are identical to the standard PUZ-HWM140YAA; only the casing durability differs.

Why choose the 3-phase (YAA) version over the 1-phase (VHA) version?

Choose 3-phase where your property already has a three-phase electrical supply, or where your DNO recommends three-phase for a heat pump of this capacity. Output, efficiency and Zubadan cold-climate performance are the same across both — the difference is purely electrical supply requirements.

What makes the Zubadan chassis different?

The Zubadan chassis uses flash injection compressor technology to sustain full heating capacity even at -7°C ambient, and continues operating down to -28°C — among the widest guaranteed ranges in the Ecodan R32 lineup.

Which cylinder sizes are compatible?

This outdoor unit is compatible with 210L, 250L and 300L Ecodan pre-plumbed cylinders. Choose the size that matches your household's hot water demand.

Do I need to be MCS-registered to install this heat pump?

The Ecodan can technically be installed by any competent heating engineer, but to claim the UK Boiler Upgrade Scheme grant the install must be carried out by an MCS-certified installer.

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