Sonniger HEATER R Unit Heater (LPHW)

Sonniger HEATER R Unit Heater (LPHW)

From: £300.00

The Sonniger HEATER R fan unit heater (LPHW) is ultra lightweight for its type and ideal for all commercial and industrial applications: retail outlets; leisure centres; exhibition halls; warehouses; factories; garages; workshops; plant rooms. Ideal for use with hot water generated from biomass boilers as well as gas and oil fired boilers. The R2 and R3 models can be used with ground source heating schemes also. The ambient-air model operates as a de-stratification device mounted horizontally.


Enquire about wholesale orders for Sonniger HEATER R Unit Heater (LPHW)

Send enquiry or call on +44 (0)1450 372103

Enquire about Sonniger HEATER R Unit Heater (LPHW)

Send enquiry or call on +44 (0)1450 372103


The Sonniger Heater R unit heater (LPHW) is a groundbreaking solution for heating commercial and industrial buildings. It is uniquely designed and manufactured from expanded polypropylene which reduces the weight of a typical 70kW unit by up to 5 times that of a traditional steel encased unit heater. This results in ease of installation for the contractor, a lifetime casing guarantee for the customer and significant benefits to the environment.

  • Modern Design
  • Output range from 16-58kW (at mean water temp 70C & internal temp 0-20C)
  • Ideal for LPHW fed from Biomass/gas fired/oil fired/ground source heating boilers
  • Max airflow range 4400 m3/hr to 4900 m3/hr
  • Extremely Light Weight – 12-17 kg when filled
  • Easy Installation with Multiple Positional Orientations: horizontal, vertical or tilted
  • Wall and Ceiling Mountable
  • Noise 56 dBA at 5m distance
  • Flexible Control Options: thermostat and 3 speed controller
  • BMS module available
  • Dark grey with 3 interchangeable inserts/flashings


Model No.Mount horizontal (m)Mount vertical (m)Unit Width (mm)Unit Height (mm)Unit Depth (mm)
Weight (kg)
Noise Level (dBa)
R1 (LPHW)3-84-12680570375 (exc bracket)11.9 (full)56
R2 (LPHW)3-84-12680570375 (exc bracket)14.8 (full)56
R3 (LPHW)3-84-12680570375 (exc bracket)16.9 (full)56
Ambient air/de-stratification unit3-84-12680570375 (exc bracket)9.256


HEATER R1               
Inlet/outlet water temperature90/7080/6070/50
Inlet air temperature051015200510152005101520
Air flow 4100 m3/h (speed 3)
Heat output kW20.819.317.816.414.917.716.314.813.411.914.713.211.710.38.8
Temperature o C1418.222.426.630.71216.220.324.528.69.914.118.222.325.3
Water flow m 3 /h0.
Pressure drop kPa18.616.314.
Air flow 2750 m3/h (speed 2)
Heat output kW16.615.514.313.111.914.21311.910.79.511.810.
Temperature o C16.720.824.828.932.814.318.322.326.330.211.815.819.823.727.6
Water flow m 3 /h0.
Pressure drop kPa8.
Air flow 2050 m3/h (speed 1)
Heat output kW14.
Temperature o C18.922.926.830.734.516.
Water flow m 3 /h0.
Pressure drop kPa6.
HEATER R2                    
Inlet/outlet water temperature90/7080/6070/5050/40
Inlet air temperature05101520051015200510152005101520
Air flow 3500 m3/h (speed 3)
Heat output kW36.533.931.428.826.331.428.826.323.821.226.223.721.118.616.120.217.715.212.710.2
Temperature o C28.932.335.73942.224.828.231.534.737.920.724.027.330.433.616.019.222.425.628.6
Water flow m 3 /h1.
Pressure drop kPa18.216.013.911.910.
Air flow 2900 m3/h (speed 2)
Heat output kW32.630.328.025.723.528.025.823.521.219.023.421.118.916.614.418.115.813.611.49.1
Temperature o C31.134.437.640.843.926.730.033.236.339.322.325.528.631.734.517.220.323.426.429.3
Water flow m 3 /h1.
Pressure drop kPa14.913.
Air flow 2000 m3/h (speed 1)
Heat output kW26.424.422.520.718.922.620.718.917.115.318.917.115.213.411.614.512.710.99.17.4
Temperature o C35.438.541.544.447.230.533.536.439.242.025.528.431.234.036.719.622.525.227.930.6
Water flow m 3 /h1.
Pressure drop kPa10.
HEATER R3                    
Inlet/outlet water temperature90/7080/6070/5050/40
Inlet air temperature05101520051015200510152005101520
Air flow 3400 m3/h (speed 3)
Heat output kW52.349.045.742.439.145.141.838.435.131.737.834.531.127.724.328.9
Temperature o C40.042.645.247.750.134.537.139.642.144.529.031.534.036.438.822.224.627.129.531.9
Water flow m 3 /h2.
Pressure drop kPa23.420.818.316.013.818.315.913.711.69.713.611.
Air flow 3100 m3/h (speed 2)
Heat output kW54.751.548.445.542.447.444.541.638.435.640.136.833.530.126.821.718.114.29.9
Temperature o C50.552.95557.15944.547.1495152.937.54042.1444620.822.724.525.8
Water flow m 3 /h2.
Pressure drop kPa14.411.910.49.17.811.
Air flow 2200 m3/h (speed 1)
Heat output kW44.24240.238.436.638.536.634.832.630.832.730.528.426.123.917.114.2116.1
Temperature o C5456.458.560.662.54850.652.554.556.44143.545.647.549.523.224.625.724.6
Water flow m 3 /h1.
Pressure drop kPa9.57.86.965.


HEATER technical manual EN T&S

  • The fan’s motor is equipped with an internal temperature limit fuse protecting the engine from overheating.
  • The unit set does not include a feeding cable or a master switch.
  • The electrical installation and connection of the automatic control should be carried out in accordance with the electrical diagram by an appropriately qualified person.
  • The installation of the unit on the water side should be done in a such a way that enables future maintenance.
  • Both stub pipes should be connected to manual closing valves in order to cut off the device.