5~14kW Packaged Hot Water Heat Pumps with built in heat exchanger. An intermediate water to water heat exchanger is required.



4.5kW / 5.0kW
60°C Hot Water at
-15°C ambient temperature


7.5kW / 9.0kW
60°C Hot Water at
-20°C ambient temperature


12.5kW / 14.0kW
60°C Hot Water at
-25°C ambient temperature

Note: Above capacity ratings are all nominal rated.


  • Reliable, year-round water heating
  • Inverter driven for maximum energy efficiency
  • Water temperatures up to 60°C
  • Operation in outdoor temperatures as low as -20°C
  • Environmentally friendly R410a refrigerant
  • Easy to use LCD Wall Controller with 7 Day Timer
  • “Eco” heating mode for outdoor ambient temperature compensation
  • Cooling mode available
  • Compact design

PUHZ-HW140 Special Features:

  • Operation in outdoor temperatures as low as -25°C
  • Heat interchange circuit for maximum system heat recovery
  • Flash injection circuit and a third port on the compressor for superior low ambient heating performance

Built In Heat Exchanger

Mitsubishi Electric Hot Water Heat Pumps are designed to both heat or cool water. The PUHZ-(H)W Series has three packaged systems to choose from: PUHZ-W50 with 5kW of heating for smaller applications such as small underfloor heating system and hot water cylinders, PUHZ-W85 with 9kW of heating for medium-sized underfloor heating systems and hot water cylinders, and PUHZ-HW140 with 14kW of heating for larger underfloor installations and hot water cylinders.

The PUHZ-(H)W packaged system comes complete with an internal 316 stainless steel brazed plate heat exchanger. This allows for easy installation of connecting water pipes. The system is controlled by the PAR-W21 LCD wall 7 day timer/controller and an advanced PAC-IF031 interface for multiple use applications, such as sanitary hot water heating by intelligently switching between the heat pump and the electrical immersion element in the hot water cylinder.

Note: Ancillary equipment such as water pumps and expansion tanks are to be provided separately by the installer, and selected to meet the individual system pressure and flow requirements.

Additional requirements for Spa and Swimming Pool use

An intermediate water to water titanium type heat exchanger is required.

Selection Guide

Use this guide to estimate your heating requirements, however units should not be purchased without advice from your heating or pool specialist. Every application is as individual as its owner. An incorrect selection may lead to unnecessary power consumption or a system with insufficient heating capability.

Spa Pools

We have a new Titanium Coil/PVC Shell heat exchanger to effectively heat where aggressive chemical treatment is present. This is matched to one of our PUHZ-RP Hot Water Heat Pump units. Alternatively use our PUHZ-W50 with an intermediate water to water heat exchanger.

Swimming Pools

Hot Water Heat Pumps enable outdoor swimming pools to be heated to a comfortable temperature to extend their use year round. Indoor pools also benefit from heating because they don’t receive the same solar gain as outdoor pools in the summer, and can be heated during winter to provide year round swimming. The heat pump size required depends on environmental aspects of the pool, including location and construction, temperature of the pool, and the air temperature. The most important factor is the pool water surface area as this is where heat is lost through evaporation. Installing a pool cover is the best way to retain this heat.

Due to the large number of variables, a simple calculation of heat pump capacity is not always possible. We recommend you check our website or contact a competent installer to have your pool heating requirement carefully assessed.