News Release

Yanmar Introduces Its New Compact Micro Gas Cogeneration System

March 29, 2016
Yanmar Energy System Co., Ltd.

The CP35D1 gas engine micro cogeneration system

In collaboration with Tokyo Gas Co., Ltd., Osaka Gas Co.,Ltd., and Toho Gas Co., Ltd., Yanmar Energy System Co., Ltd. introduces the CP35D1 35 kW micro gas cogeneration system*1. All four companies will commence sale of the CP35D1 in Japan as of April 1.

Yanmar’s micro cogeneration systems up to the 100 kW range are well regarded due to the company’s years of experience as an engine manufacturer, for being built in Japan with a reputation of reliability, and for employing full functionality essential for systemization. This is further strengthened with competitive pricing and a compact unit size, optimized with comprehensive telematic serviceability for additional productivity.

Yanmar’s cogeneration systems use gas as the fuel source for electricity generation, and the resulting exhaust heat can then be utilized for additional energy purposes such as for the hot‐water supply. From the perspectives of CO2 reduction, less energy consumption during peak hours, and risk minimization, Yanmar’s cogeneration systems are the perfect choice for a wide range of facilities including hospitals, restaurants, factories and hotels.

Combustion system optimization has led to a significant reduction in engine size, allowing for this 35 kW engine to be as compact as a 25 kW micro cogeneration engine would typically be — compared to previous models that’s a 27% decrease in space that the unit requires. This is further backed up by an industry-leading overall-efficiency*2 of 88%.

  • *1Gas cogeneration systems use natural gas or biogas as the fuel source for electricity generation, and the resulting exhaust heat can then be utilized for additional energy purposes such as for the hot‐water supply. For establishments looking to satisfy both energy and hot water requirements, gas cogeneration systems are proven to be highly effective due to their low cost and fuel-efficient capabilities, further reinforced by their impressive overall-efficiency. (Large-size cogeneration: 2000 kW and above, mid-size cogeneration: 300-1999 kW, small-size cogeneration: less than 300 kW, micro cogeneration: in the small-size range, however less than 100 kW.)
  • *2Overall-efficiency is factored as the amount of outputted energy compared to the amount of inputted energy. For cogeneration systems the electricity generated and the reusable energy derived from the exhaust heat make up the amount of energy output.

Key Features

1. Indoor Installation Enhancements
Reduction of Installation Space Requirements
By utilizing stoichiometric combustion all fuel is completely combusted, enabling this 35 kW cogeneration system to be reduced to the size of a 25 kW. The end result is a 27% decrease (a depth reduction of 300 mm) in the installation space required compared to previous 35 kW models.

Maneuverability Improvements
Internal layout modifications allow for the top and bottom of the unit to be separated, enabling easier installation in tight quarters.

Water-cooled Availability
With conventional air cooled radiators built for the purpose of heat dissipation, a considerable effort was required in the duct installation process, putting restrictions on where they could be installed. Now, optionally for facilities in which a cooling system is already in place, the CP35D1 can be connected directly to the existing cooling system, utilizing cold water for cooling, thereby taking away the need for a built-in radiator. The end result is more options available for where to install the CP35D1.

2. Better Overall-Efficiency
Stoichiometric combustion benefits from having a higher exhaust temperature compared to other combustion systems. Now, with enhancements to the heat exchanger which recovers exhaust heat, in addition to improvements in pipe configuration and thickness, better heat exchange efficiency has been achieved, resulting in industry-leading overall-efficiency for micro cogeneration systems.

35 kW Micro Cogeneration Specifications

Specification New Products Previous Models
Standard Spec*4
Spec for Power Outages*4
Standard Spec
Spec for Power Outages
Rated Power(kW) 35 35 35 35
Heat Recovery(kW) 56.9 56.9 52.5 52.5
Heat Recovery
Outlet Temperature(℃)
80 (max 88℃) 80 (max 88℃) 80 (max 88℃) 80 (Max 88℃)
Efficiency Overall Efficiency(%) 88.0(87.0)*5 88.0(87.0)*5 85.0(84.0)*5 85.0(84.0)*5
Generating Efficiency(%) 33.5 33.5 34.0 34.0
Heat Recovery Ratio(%) 54.5(53.5)*5 54.5(53.5)*5 51.0(50.0)*5 51.0(50.0)*5
Dimensions Width(mm) 2,000 2,000 2,000 2,000
Depth(mm) 800 800 1,100 1,100
Height(mm) 1,995 1,995 2,000 2,000
Weight(kg) 1,350 1,390 1,470 1,530
Combustion System Stoichiometric Stoichiometric Lean-burn Lean-burn
Suggested Retail Price
(excl. tax)(JPY)
10,300,000 11,800,000 10,300,000 11,800,000
  • *4Both models are available without a radiator
  • *5Numbers in brackets represent efficiency at a hot water temperature of 88°C

About Yanmar

With beginnings in Osaka, Japan in 1912, Yanmar was the first ever to succeed in making a compact diesel engine of a practical size in 1933. Moving on, with industrial diesel engines as the cornerstone of the enterprise, Yanmar has continued to expand its product range, services, and expertise to deliver total solutions as an industrial equipment manufacturer. As a provider of small and large-size engines, ag machines and facilities, construction equipment, energy systems, marine, machine tools, and components — Yanmar’s global business operations span seven domains.

On land, out at sea, and in the midst of the city, Yanmar’s Mission of “providing sustainable solutions focused on the challenges customers face, in food production and harnessing power, thereby enriching people’s lives for all our tomorrows,” stands testament to Yanmar’s determination in providing us with “a sustainable future.” For more information, visit Yanmar Co., Ltd. at its worldwide website at


Public Relations Group
Brand Communication Division, Yanmar

  • Note: Information contained in the news release is valid at the time of publication and may differ from the most recently available information.