Unit comparison: Boilers & furnaces
Efficiency is given as seasonal efficiency relative to the gas's lower heating value (Hi) – for condensing boilers it can therefore exceed 100%, since they also recover heat from the flue gases that would otherwise escape through the chimney. Figures refer to commonly sold power variants and may vary slightly by model.
Manufacturer | Model | Power range | Efficiency | Energy class | NOx class |
|---|---|---|---|---|---|
| Viadrus | Garde G42 ECO 4Z020TH | 8–30 kW | 93,5 % | B, C | - |
| Protherm | Panther Condens 12 KKO-A | 3,9–12 kW | 109,5 % | A | - |
| Junkers | Cerapur Compact ZSB 24-1 DE | 3,3–25,2 kW | 109 % | A | - |
| Protherm | Gepard Condens 18/25 MKV-A | 5,3–19,1 kW | 108,5 % | A | 5 |
| Bosch | Condens GC2300iW 22/25 C | 3,4–23,2 kW | 108,5 % | A | - |
| Protherm | Tiger Condens 25 KKZ21 | 4,9–25,5 kW | 108,4 % | A | - |
| Junkers | CerapurSmart ZSB 22-3 CE | 20–29,9 kW | 108 % | A | - |
| Baxi | Nuvola Duo-Tec+ 24 | 3,4–24 kW | 105,8 % | A | 6 |
| Protherm | Tiger Condens 20/26 KKZ42 | 2,8–21,9 kW | - | A | - |
| Protherm | Medveď Condens 35 KKS | 10,1–35 kW | - | A | - |
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