by Retra
  • The combined solid fuel boiler "retro-4M" adapted to work in two modes:

    1. Daily automatic fuel supply in the form of pellets, wood, peat, husks, sawdust, etc.
    2. Mode manual loading firewood, coal, fuel briquettes and other fuel.

    Equipment efficiency reaches 93%. The price included a boiler hopper with screw, fire extinguishing system, pellet burner, fans, remote management, security group.

  • In 2010, PE "Retra-3M" developed and started production of combined solid fuel boilers "Retra-4M" adapted to work in two modes:

    • Automatic fuel supply (pellets, coal fraction to 15 mm). Downloads fuel is carried out automatically from the hopper auger screw (driven motor-gear) to a pellet burner. The most effective combustion of fuel in the pellet burner is ensured by blowing air that carried a fan. Jobs screw conveyor fan and microprocessor controlled thermostat.
    • Hand-feed the fuel (wood, coal, briquettes etc). Downloads fuel is through the door. The process efficient combustion in the furnace is carried out by intensive air supply on the perimeter of the chamber. It formed "air cocoon" around the fuel. The gas burned in the furnace due to lack of air burns due to secondary air supply. This ensures high efficiency, reaching 93%.


    • Two inserts upper material for burning large, lower - for combustion using small pellet burner fuel;
    • Work in manual and automatic mode;
    • The use of different fuels, more accessible consumer;
    • Increased storage hopper ensures continuous operation of the boiler to 3-5 days;
    • Double fire prevention in shnetsi.

    The manufacturer does not stop and constantly improving products, creating a more modern and attractive design, improving technical and ergonomic characteristics of boilers, expanding sector equipment.

Manufacturer Retra
Contact Details e-mail:; tel. / fax: +380362256038; Address: Ukraine, 33024, Rivne, Starytskoho str. 45; Website:
Manufacture Product Details
Technology biomass, firewood, fuel briquettes, pellets
Max Capacity in kW 32.0
Min Capacity in kW 16.0
Efficiency in % 85.0

Annual savings
Annual savings: UAH 8,500 / 7,000 kWh*

Annual energy baseline for heating 39,722kWh/a

Annual energy after replacement RETRA 32-4М

Your annual savings


1. Inclusion of the technologies, equipment and materials in the Technology Selector is based solely on qualification under IQ energy’s ‘Minimum Energy Performance Standards’** and does not constitute an endorsement of the producers or suppliers of these products by the EBRD. Although every effort has been made to present correct and up to date data, EBRD does not accept responsibility for the accuracy of the data presented.

**Included technologies ‎have been assessed to result in at least a 20% higher energy performance than the market average

2. The savings are calculated for the refurbishment of an average dwelling or the replacement of an average equipment in Ukraine. The actual savings of individual refurbishment projects/equipment can differ from the indicated savings due to specific climatic conditions, size of the dwelling/equipment, consumer behaviour, etc. The displayed energy efficiency measures only have an impact on individual household's bills (savings) if there is consumption based billing available.

3. Even though we have taken reasonable care to apply up-to-date energy prices when calculating savings in UAH, we do not take responsibility for the accuracy of any savings estimates stated on this Site.

4. All prices displayed in our Technology Selector are provided by the suppliers as indicative retail prices and should be used for reference purposes only. The actual prices of the vendors/retailors can be different from those on our web site due to various reasons beyond the influence of IQ energy programme. IQ energy programme does not bear any liability for the price information of any specific product. Please, check with suppliers actual prices for products and technologies you are interested in.