air to water 

heat pumps

Renewable heating and hot water systems have become the norm rather than the exception.

With advances in technology an air source heat pump is possibly the most cost effective solution for any new build dwelling.

How They Work
Air source heat pumps generate heating water under the same principles as your refrigerator cools its contents. 


  • Energy is extracted from air and transferred to refrigerant gas. 

  • This preheated gas is then compressed into a high temperature vapor. 

  • The vapor is sent to the indoor unit.

  • Its heat is then transferred to the systems        heating water. 

  • The heated water is circulated around your house to the various underfloor loops, radiators etc.

The efficiency of a heat pump is rated upon its coefficient of performance - COP.  In basic terms this means the amount of electricity required to generate the output.

For instance a unit with a COP of 5, will require 1 kW of electricity with 4 kw from the atmosphere to generate 5 kW of output.

awh / awt v5+


All air source heat pumps operate under the same general principles. 
However the differences in quality, technology and application vary drastically.

The new AWH V5+ series exhibits a number of cutting edge, technological and practical advances to create the optimum living environment.



The AWH V5+ series has been designed to fit in with the aesthetics of the modern home.

The V5+ series comes with a grey powder coated metal housing, stainless steel cover and black coated grills and fans.


These measures greatly improve the appearance of the unit but also serve to protect the longevity of the unit.


electric elements

Immersions are often used to provide high temperature hot water, supplement the heating system and/or during defrosting cycles. 

The V5+ series is one of the only heat pumps without an integrated electric heater. 

At ES we believe that a truly efficient product, which has been developed to the highest of standards should not require boost or back up from additional heaters.


low temp

The efficiencies of heat pumps are maximised at lower temperatures. When they are utilised to generate high temperature the efficiencies drop dramatically especially in colder weather conditions. 

This often results in the use of electric heaters and  / or increased electrical bills.

The V5+ series is a low temperature heat pump with its flow restricted to 48°C. With modern houses utilising underfloor and aluminium radiator heating the preferred flow temperature range is 30 -45°C. 

For hot water generation we use the HEMERA hot water unit, which is specifically designed for hot water generation. This maximises the real life efficiency of the system.



Condensation often forms and freezes on the outdoor heat exchanger of a heat pump. This prevents air flow through the exchanger and so must be removed through a cycle known as defrosting. 

Traditional defrosting cycles utilise the stored heat within a buffer or electric element to deice the unit, steeling heat back from the dwelling and increased electrical consumption.

The V5+ series has a proactive defrosting cycle, AVISA. An outdoor sensor indicates the beginning of freezing and before excessive ice builds up the AVISA cycle begins. 

The AVISA cycle diverts hot gas around the heat exchanger, clearing the build up in moments and allowing the unit to revert back to providing heating.



The V5+ series represents the latest advancements in heat pump technology.

This series of heat pumps is of split design - DELA. In standard monoblock units the heating water for the dwelling flows through the outdoor unit where it is heated.

With the DELA design the heat generated by the outdoor unit is delivered to the indoor unit in the medium of refrigerant gas 410A.

The heat energy in the gas is then transferred to the heating water in the indoor unit. This format greatly increases efficiency, especially in colder weather conditions and deicing cycles.



The V5+ series contains our latest LEN technology.


This technology allows the unit start the compressor and fan at their lowest setting. 

This technology prevents surges to the electrical system of the dwelling and reduces the noise of the unit. 



The V5+ series heat pump incorporates the latest inverter technology. This technology allows a heat pump to match its output exactly to the requirement of the dwelling. 

The inverter technology continuously monitors the heating requirement of the dwelling. As the heat demand increases and decreases, the inverter increases the units output accordingly.

This technology drastically reduces energy consumption and creates an optimum living environment.



in conjunction with seamless modulation the v5+ series also utilises climate control technology.


Climate Adjustment technology works by increasing and decreasing the heat pumps flow temperature according to external temperatures.

The minimum and maximum desired flow temperatures are entered into the unit and the unit will control the flow temperature for the system based upon external, internal and desired temperatures.





power supply

heating capacity 

heating power input



noise level indoor/outdoor

indoor dimensions w.d.h

outdoor dimensions w.d.h

net weight indoor/outdoor

ambient temp range

refrigerant piping















awh / awt v5+ 9


220-240 / 50 / 1 

4.330 - 10.100

0.975 - 2.153



43 / 

380 . 257 . 580

934 . 354 . 753

23 / 63

-25 - +45

3/8" & 1/2"

awh / awt v5+ 11


220-240 / 50 / 1 

4.670 - 11.500

0.915 - 3.029



45 / 

380 . 257 . 580

1044 . 414 . 763

23 / 75

-25 - +45

3/8" & 1/2"

awh / awt v5+ 13


220-240 / 50 / 1 

4.200 - 12.600

0.926 - 3.072



46 / 

1124 . 460 . 1195

23 / 113

-25 - +45

3/8" & 5/8"

5 year


*EN14825 A7/W35