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G515 Series Oil Boiler

Buderus developed the full three pass system to increase the heat transfer and efficiency of boilers. This design allows more heat to be transferred during all three passes, unlike conventional boilers that only use one pass to transfer heat. This system maximizes the total possible heat available with the lowest fuel consumption possible. To greatly decrease standby loss Buderus has manufactured a 3½" and 4" thick thermal insulation.

  • High Efficiency - Combustion Efficiencies Up To 88%
  • Thermostream Design Eliminates Thermal Shock
  • Flexible, Corrosion Resistant GL-180M Cast Iron
  • Full Swing Reversible Burner Door for Excellent Serviceability
  • Eliminates the need for bypass loop or shunt pump
  • No additional requirements for firing with 2-stage or full modulation burners
  • Suitable for operation with oil or gas
MODELOutput MBtuHIBR MBtuHFiring Rate GPHAFUEWater Content Gal.HxWxDWeight. Lbs.BOILER H/PVENT CONNECTIONSUPPLY / RETURN CONNECTION# SECTIONS
G515-7818.0 711.0 0.00 88.2 68.20 52.25 x 38.5 x 54.5 2731 24.5104 / 47
G515-81009.0 877.0 0.00 88.2 77.70 52.25 x 38.5 x 61 3059 30.2104 / 48
G515-91200.0 1043.0 0.00 88.1 87.20 52.25 x 38.5 x 67.5 3505 35.9104 / 49
G515-101391.0 1210.0 0.00 88.1 96.70 52.25 x 38.5 x 74.25 3864 41.6104 / 410
G515-111582.0 1376.0 0.00 88.1 106.20 52.25 x 38.5 x 81 4188 47.3104 / 411
G515-121773.0 1542.0 0.00 88.1 115.70 52.25 x 38.5 x 87.5 4541 53.0104 / 412

Warranty Information

  • Heat Exchanger - Limited Lifetime Warranty on Cast Iron Heat Exchanger in Residential Settings
  • All Parts for 12 months -

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