FeatureSpecification
1. Environmentally friendly: Ultra-low nitrogen oxide emissions; All has indoor thermostat interface, energy saving and gas saving.
2. Multiple protections: anti-dry heating;Anti-exhaust pipe blocking; Wind pressure monitoring;Anti-freezing protection (3 level); Over temperature alarm; Flameout protection; Electric leakage protection plug.
3. Some models are equipped with frequency conversion fan which has higher energy efficiency performance in each power level.
