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Summer News


The Calorex HOT list!

The Calorex HOT list!
Calorex Variheat


The ingenious, multi-tasking Calorex Variheat Series 3 air handling unit, featuring a PLC touchscreen as standard and endless configuration options, offers the ultimate in flexibility to suit almost every plant room. Total peace of mind is provided as commissioning is included in the price, together with a 2-year on-site parts and labour warranty.

By utilising this method, energy costs are kept to a minimum. Typically, for every unit of power that a Variheat consumes, it will convert more than twice this amount to usable heat. The potential energy savings are huge. In fact, compared to traditional heat and ventilation, considerable energy cost saving can be made and corresponding CO2 emissions can be dramatically reduced.

Pre-set at the factory, Variheat fans will automatically speed adjust to differing duct work and/or system air filter resistances, ensuring optimum air flow is constantly maintained. This reduces commissioning time and automatically optimises performance, power consumption and noise levels.

The Variheat features internet connection capability to PC, smart-phone or selected BMS that provides remote monitoring and set point control; comprehensive diagnostic information and EC/Inverter constant flow fans.



Designed and engineered in the UK, the Calorex Delta is a unique multi-functional single unit which features touch screen technology as standard. It is the ultimate environmental control system, designed to take full control of the whole indoor environment and pool water heating. The Delta comes with a two-year warranty and commissioning is included in the price.

A comprehensive range, there’s a Delta to suit pools of every size. The system is specifically designed to provide the environmental comfort and moisture-related structural protection necessary for a pool in the most efficient way.

Totally self-contained, the Delta will remove moisture and recover energy which is then re-used to heat the pool water and air. By utilising this method of heat recovery, energy costs are kept to a minimum. Typically, for every unit of power that a Calorex heat pump consumes, it will convert 2.4 times this amount to usable heat. The potential energy savings are huge. In fact, compared to traditional heating and ventilation methods, cost savings of over 50% are achievable while corresponding CO2 emissions can be dramatically reduced by as much as 70%.

The Calorex Delta 14 and 16 benefit from ECA Scheme Approval meaning they are recognised as being able to provide low carbon and energy efficient environmental control. They are the only swimming pool heat pump heat recovery machines to be included in the Government Cash Back Scheme.


Heat pumps

The Calorex I-PAC and V-PAC Inverter heat pump range are specifically designed in the UK for the UK climate.

These stylish and modern looking heat pumps come in a side and top outlet with the I-PAC (‘X’) and V-PAC air temperature range from -5 deg C to 43 deg C and the I-PAC + (‘Y’) range down to -10 deg C.  They feature an increased range of power ratings from 8-25 kW. Such is Dantherm’s confidence in their heat pumps, they come with a five-year on-site parts and labour warranty.

Inverter heat pump technology allows for efficient control of the pool temperature with the I-PAC/V-PAC only using what energy is needed when it is required. High efficiency with modulating step-less inverter compressor gives an average COP of 10.3 (I-PAC+), 9.7 (I-PAC) and 10.7 (V-PAC), which is twice as efficient as the older on/off models.

Complying with the new F-Gas regulations in Europe, the heat pumps use the low Global Warming Potential (GWP) refrigerant R32. It requires less refrigerant volume per kW and is easier to recycle. The heat pumps are of a compact size with a small footprint and compliant with permitted development rights. The I-PAC is made from aluminium alloy and the V-PAC from ABS.

The I-PAC side outlet models have WiFi capability for remote control. They can also be set to two modes, ‘boost’ for quick start-up and ‘whisper’ for super quiet day to day running. Other bonus features include 9-11 dB(A) sound reduction compared to a traditional on/off heat pump, with ‘whisper mode’.


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