Buderus G215
Model Number: G215
Premium German cast iron boiler built to last generations.
Technical Specifications
Source: manufacturer spec sheet · checked Sep 27, 2026
Some figures come from distributor listings and are still being verified against the manufacturer.
Prices depend on sizing, venting and piping in your home, so we quote every installation.
Sizing: the right size comes from a room-by-room heat-loss calculation, not the size of the old boiler or a rule of thumb. Oversized boilers short-cycle and waste fuel; steam systems are sized to the connected radiation instead. See how we approach boiler installation.
Home-Specific Operating Cost Review
No guaranteed annual savings or payback period
Historical Use
Fuel consumption and weather
Current Rates
Utility and delivered-fuel prices
System Design
Load, piping, controls, and temperatures
Full Specifications
- Model Number
- G215
- Efficiency (AFUE)
- 86%
- Boiler Type
- Hot Water Boiler
- Fuel
- oil/gas
- Venting
- chimney
- BTU Input Range
- 134k - 294k BTU
- Domestic Hot Water
- indirect-ready
- In Production
- Yes
- Parts Warranty
- 1-yr full parts; heat exchanger (cast iron) 2nd–10th year prorated leak warranty per residential cast-iron/oil boiler warranty (covers GA124/GC144/G234X/G334X/G115WS/G215/G315)
- Heat Exchanger Warranty
- 1-yr full parts; heat exchanger (cast iron) 2nd–10th year prorated leak warranty per residential cast-iron/oil boiler warranty (covers GA124/GC144/G234X/G334X/G115WS/G215/G315)
Specifications sourced from the manufacturer spec sheet, checked Sep 27, 2026.
Some figures come from distributor listings and are still being verified against the manufacturer.
Ideal For
Homeowners wanting ultimate longevity
Expert Review: Buderus G215
The Buderus G215 is the cast iron option from the German engineering specialists. This floor-standing boiler combines German build quality with proven cast iron durability. At 87% AFUE, it won't qualify for efficiency rebates, but the exceptional construction quality provides long-term value.
Cast iron construction with German engineering provides durability that exceeds typical American-made alternatives. The oil or gas compatibility suits various fuel requirements.
Parts availability through the Bosch/Buderus network supports service throughout Nassau County.
Our recommendation: The G215 is ideal for homeowners who value German build quality in a traditional cast iron format. Best for applications where condensing technology isn't practical.
Key Features & Technology
Cast iron Eurosection design
Modular construction
German engineering
50+ year lifespan
Oil or gas compatible
Advantages
- Cast iron plus German quality
- Unique modular design
- Legendary longevity
- Buy it once mentality
Considerations
- Heavy may need floor reinforcement
- 87% AFUE no rebates
- Premium pricing
Sizing & Installation Notes
Hot water boilers like the G215 are sized from a room-by-room heat-loss calculation. We never match the old boiler's size — oversized units short-cycle, waste fuel and wear out years early.
Every Buderus installation starts with a free in-home assessment covering the heat-loss calculation, venting and chimney condition, and gas or oil supply sizing. Learn more about our boiler installation process, or see current rebate and incentive programs that may apply.
Warranty & Protection
Parts Warranty
1-yr full parts; heat exchanger (cast iron) 2nd–10th year prorated leak warranty per residential cast-iron/oil boiler warranty (covers GA124/GC144/G234X/G334X/G115WS/G215/G315)
Heat Exchanger
1-yr full parts; heat exchanger (cast iron) 2nd–10th year prorated leak warranty per residential cast-iron/oil boiler warranty (covers GA124/GC144/G234X/G334X/G115WS/G215/G315)
Our Guarantee
100% Satisfaction
All Buderus boiler installations by Home+ Air & Heat include our 1-year workmanship warranty, covering labor and any installation-related issues.
Compare the Buderus Lineup
| Model | Efficiency | BTU Range | Fuel | Heat Exchanger Warranty |
|---|---|---|---|---|
| G215 (this model) | 86% AFUE | 134k - 294k BTU | oil/gas | 1-yr full parts; heat exchanger (cast iron) 2nd–10th year prorated leak warranty per residential cast-iron/oil boiler warranty (covers GA124/GC144/G234X/G334X/G115WS/G215/G315) |
| GB142 | 95% AFUE | 50k - 199k BTU | — | Lifetime |
| G234X | 95% AFUE | 100k - 285k BTU | — | Lifetime |
| G115WS | 87% AFUE | 74k - 161k BTU | oil | lifetime |
See the full Buderus brand page for lineup context, or browse the Best Oil Boilers 2027 guide to compare across brands.
Frequently Asked Questions
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