Advantages and Disadvantages
| Energy sources | Investing costs | Energy costs | Maintenance costs | Environmental friendliness |
|---|---|---|---|---|
| Solar heating | Medium | Very low | Low | Very high |
| Heat pump | Medium | Medium | Low | High |
| Bio fuel / Pellets | High | Medium | High | High |
| Gas | Low | Medium | Low | Medium |
| Electric boiler | Low | High | None | Medium |
| Oil boiler | Medium | High | Low | Very low |

























