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HDG H20/25/30

Product catalog summary

Technical Specifications
The document provides detailed technical specifications for the HDG H20, H25, and H30 log wood boilers. Key performance data includes nominal thermal power of 20 kW, 25 kW, and 30 kW respectively, with a boiler efficiency of 93.1% at nominal power. The boilers require an auxiliary energy of 82-83 W and operate on a 230 V/50 Hz electrical supply with a 10 A back-up fuse.

General Boiler Data
All models are classified as boiler class 5, with a maximum operating pressure of 3 bar and a supply temperature of up to 95°C. The water capacity is 120 liters, and the fuel chamber holds 165 liters with a depth of 580 mm. Each boiler weighs 590 kg.

Flue Calculation Data
The flue gas temperature ranges from 140°C to 160°C, with a mass flow of 0.015 to 0.023 kg/s. The CO2 content at nominal power is between 13.6% and 15.2%. The required flue draught is 8 Pa, and the flue pipe connection diameter is 150 mm.

Water-side Connections
Flow and return connections are DN 25 with internal threads, while safety heat exchanger connections are DN 15 with external threads. The recommended minimum pipe dimensions are DN 25.

Other Information
Burning time per fuel filling varies by wood type, with beech lasting up to 7 hours and spruce up to 6 hours. The sound pressure level is below 70 dB(A), and the minimum air inlet cross-section is 150 cm².

Installation and Dimensions
The document includes technical drawings and minimum clearance requirements. The minimum ceiling height is 2.00 m, with a recommended height of 2.30 m. Specific dimensions for installation are provided, including a boiler height of 1540 mm and a width of 910 mm. The total length with an open fuel chamber door is 1510 mm.

Catalog excerpts

Boiler type General boiler data_ Boiler class_ Maximum permissible operating pressure Maximum supply temperature 2) Minimum return temperature Water capacity Fuel chamber capacity Fuel chamber depth_ Dimensioning data for flue calculation (DIN EN 13384-1) Flue gas temperature (Tw) at nominal thermal power Flue gas mass flow at nominal load 1 CO2content at nominal thermal power 1 Required flue draught (Pw)_ Diameter of flue pipe connection Height to centre of flue gas connecting pipe Water-side connections Flow and return connections (socket) Safety heat exchanger connections (socket)_ Drain connection (socket)_ Recommended minimum pipe dimensions Water-side resistance at nominal thermal power, 10K 1 Water-side resistance at nominal thermal power, 20K 1 DN 25, int. thread 25, int. thread 25, int. thread Other information 1 Figures as per type-approval test to DIN EN 303-5 by TOV-Sud 2) Maximum operating temperatures of up to 110 °C can also briefly occur. 3) Observe country-specific guidelines HDG Bavaria GmbH ■ D-84323 Massing ■ www.hdg-bavaria.com ■ All prices shown are exclusive of services and value added tax. Subject to technical or price changes and corrections. Our general terms and conditions apply exclusively.

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Price catalogue 2016/2017 Page 17 HDG Bavaria GmbH ■ D-84323 Massing ■ www.hdg-bavaria.com ■ All prices shown are exclusive of services and value added tax. Subject to technical or price changes and corrections. Our general terms and conditions apply exclusively. Minimum ceiling height: 2.00 m Recommended ceiling height:: 2.30 m Caution: Observe the installation dimensions and the tilting height of the accumulator. ; in conjunction with and optional oil/gas burner unit

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HDG H20/25/30

HDG H20/25/30

Catalog excerpts

All HDG Bavaria GmbH Heizsysteme für Holz catalogs and technical brochures