Condensing Unit Heater – Natural Gas or Propane Fired

Output Range 8.2 kW to 62 kW

The condensing unit heater is a new eco-friendly and efficient solution that is unique on the market. This solution is comprised of a stainless steel gas condensing heat exchanger, a premix burner and a water heat exchanger. It ensures the highest efficiency from 98% to 108% use the latest technologies available resulting in reduced running costs, noise and emissions.The unit is so efficient that quoted savings in gas consumption of up to 30% can be achieved when compared to a conventional gas fired unit heater, so if you want the most modern and most technologically advanced condensing unit heater, then range this is for you!

The most efficient condensing gas technology (108%) With condensing boiler and water heat exchanger

Condensing Unit Heater Advantages:

Pre-mix gas burner with low NOx emissions (class 5)condensing unit heater
Efficiency from 98% to 108%
Power modulation from 100% to 20%
Smart control system by Modbus
Combustion and heating circuits separated
Quick warm up in less than 40 seconds
Fumes evacuation system in polypropylene Dia.80 mm
Option: Airflow modulation from 100% to 20%

Condensing Unit Heater – Technical Characteristics:

Natural gas or propane gas
4 models from 30 kW to 70 kW Input
ERP2013/2015 fan
Wall or roof flue pipes

These units come with a fully modulating burner and have a high degree of efficiency. The heat is available immediately ( within 40 seconds) after starting the heater with no lead time as opposed to a wet heating system.

The core of the units is the patented stainless steel heat exchanger for a high air flow, which has a warranty of 5 years.

The hot air is emitted by powerful, yet silent axial fans(very quiet operation ), which are fully modulating. Optimized air outlet louvers ensure a perfect air distribution. The fans permit the heat exchanger to transfer the heat optimally, and the combustion chamber cannot overheat. The number of fans is adapted to the units’ power.

Condensing Unit Heater Advantages

  • Premix gas burner, low NOx   (lower than 20 mg/kWh)
  • High thermal efficiency From 98 to 108%
  • Power modulation From 30% to 100%
  • Adjustable air flow From 20% to 100%
  • Communicating system by Modbus IP
  • Separation of combustion and
    heating circuit
  • Quick warm up
  • Water temperature into the coil  does not exceed 85°C

Customer benefits

  • The latest technology Environmental friendliness
  • The highest efficiency on the market, Reduce the energy consumption
  •  Uses only the power required to provide maximum savings
  • Helps to keep constant air blowing temperature
  • Intelligent regulation Connection to all BMS possible
  • Total safety : no combustion product can be mixed with air flow
  • Less than 1 minute Instant comfort
  • No risk of overheating

Mounting the units is very simple; they are designed for wall-mounting or to be suspended from the ceiling. The flueing options include a co-axial or sometimes referred to as a balanced flue set up , which can terminate either vertically through the roof or horizontally through the wall.

These Condensing Unit Heaters are perfectly suited to warm air heating of –

  • Warehouses
  • Factories
  • Workshops
  • Garages
  • Sports Halls
  • Churches
  • Retail Units
  • Or anywhere where you require heat , and either floor space is at a premium , or due to the nature of the building , it would benefit from the condensing unit heater / heaters being wall mounted or suspended from the roof


Models        FHCAU30H        FHCAU40H        FHCAU50H        FHCAU70H
max min max min max min max min
Heat input LHV (kW) 27 7.7 36 10.8 45 12.6 63 17
Heat output (kW) 26.5 8.2 34.9 11.5 44.1 13.6 61.7 18.3
Efficiency LHV (%) 98 108 98 108 98 108 98 108
Air flow T 15°C (m³/ h)                2,700                3,450                4,600                 5,500
NOx class                                                                                            5


A (mm) 1067 1080 1192 1400
B* (mm) 842 842 842 842
C (mm) 574 624 674 774
Ø Gas 1/2″ 1/2″ 1/2″ 1/2″
Ø Fumes (mm) 80 80 80 80
Ø Air (mm) 80 80 80 80
Weight (kg) 88 99 110 135

Condensing warm air unit heaters
can be operated on natural gas or liquefied propane gas (LPG) and have been on the market for quite a few years now, so the technology can be considered to be well proven. They achieve higher efficiencies by the utilization of a secondary internal heat exchanger, which turns the residual heat in the flue gases, which would be lost in a conventional non condensing unit heater, into useful heat energy. Therefor the rate of heat transfer into the warm air is increased without any additional fuel consumption

With any condensing unit heater there is a reduction in flue-gas temperature to below dew point, subsequently liquid condensate is produced . Just like condensing boilers ,this condensate is collected within the condensing unit heater and should flow to a drain point for safe removal.

Part L2 of the Building Regulations –

At present this regulation requires a minimum 91% nett efficiency with regards to warm air space heaters, which can be achieved by non-condensing unit heaters currently.However  Energy Technology List criteria mean that to qualify for Enhanced Capital Allowances (ECAs), warm air space heaters will need to operate in condensing mode with minimum full and part load efficiencies of 101% nett. It currently looks like that ecological and legislative pressure will make condensing technology for warm air heaters mandatory in the UK in a very short time period, and future reversions of the Building Regulations Part L2 , will probably cover this requirement.

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