ZunZhi ZZ-01
Gas-fired Combi Boiler
This product employs intelligent multi-stage combustion technology, automatically adjusting flame stages according to actual heating and hot water demands to precisely match varying power requirements—reducing frequent on/off cycling, enhancing operational stability, and extending overall service life.
It integrates a DC brushless variable-frequency motor that dynamically optimizes the air-to-gas ratio in real time, ensuring more complete combustion while delivering both high efficiency and stable output. Its compact body design reduces volume by approximately 15%–20% versus conventional models, effectively saving indoor installation space—making it especially suitable for diverse residential environments.
The unit also supports smart remote control, enabling convenient features such as "Away Mode" and "Home Preheating", along with real-time system monitoring and safety alerts. Its ultra-quiet operation—achieved via noise-optimized DC variable-frequency fan design—delivers operating noise as low as 38–45 dB, ensuring peaceful nighttime heating. Dual-mode operation (space heating and domestic hot water) allows effortless switching, with constant-temperature DHW delivery for consistent comfort—fully meeting year-round household heating and hot water needs.
Category:
Gas-Fired Condensing Combi Boiler- Intelligent Multi-Stage Combustion Technology — Reduces Cycling & Extends Lifespan
Automatically adjusts flame stages based on demand to precisely match varying power requirements. - DC Brushless Variable-Frequency Motor
Variable-frequency technology dynamically regulates air-to-gas ratio for optimal combustion—achieving 30%–50% energy savings. - Smart Remote Control
Supports “Away Mode” and “Home Preheating” functions; enables real-time monitoring and safety alerts. - Compact Design — Saves Space
Reduces footprint by ~15%–20% versus traditional units, maximizing usable indoor area. - Ultra-Quiet & Smooth Operation
DC variable-frequency fan with noise-optimized design ensures operating noise as low as 38–45 dB—ensuring silent nighttime heating. - Stable Constant-Temperature DHW Delivery
Supports independent heating and DHW modes with seamless switching—meeting year-round household heating and hot water needs.
| Parameter | LL1PB20-B | LL1PB24-B | LL1PB28-B | LL1PB32-B | LL1PB36-B | LL1PB40-B |
|---|---|---|---|---|---|---|
| Gas Type (12T) | Natural Gas | Natural Gas | Natural Gas | Natural Gas | Natural Gas | Natural Gas |
| Rated Gas Pressure (Pa) | 2000 | 2000 | 2000 | 2000 | 2000 | 2000 |
| Rated Heating Output (kW) | 20 | 24 | 28 | 32 | 36 | 40 |
| Minimum Heating Output (kW) | 7 | 8.4 | 9.8 | 11.2 | 12.6 | 14 |
| Rated DHW Output (kW) | 20 | 24 | 28 | 32 | 36 | 40 |
| Rated Heating Output (80℃/60℃) (kW) | 18 | 21.6 | 25.2 | 28.8 | 32.4 | 36 |
| Minimum Heating Output (80℃/60℃) (kW) | 6 | 7.2 | 8.4 | 9.6 | 10.7 | 12 |
| Max. System Pressure (MPa) | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 |
| Recommended DHW System Pressure (MPa) | 0.03–0.7 | 0.03–0.7 | 0.03–0.7 | 0.03–0.7 | 0.03–0.7 | 0.03–0.7 |
| Minimum DHW Flow Rate to Activate (L/min) | 3 | 3 | 3 | 3 | 3 | 3 |
| Hot Water Production Capacity at Δt = 25℃ (kg/min) | 10 | 12 | 14 | 16 | 18 | 20 |
| Radiator Temperature Adjustment Range (℃) | 30–80 | 30–80 | 30–80 | 30–80 | 30–80 | 30–80 |
| Underfloor Heating Temperature Adjustment Range (℃) | 30–60 | 30–60 | 30–60 | 30–60 | 30–60 | 30–60 |
| DHW Temperature Adjustment Range (℃) | 30–60 | 30–60 | 30–60 | 30–60 | 30–60 | 30–60 |
| Power Supply (AC) | 220V～50Hz | 220V～50Hz | 220V～50Hz | 220V～50Hz | 220V～50Hz | 220V～50Hz |
| Electric Shock Protection Class | Class I | Class I | Class I | Class I | Class I | Class I |
| Enclosure Protection Rating | IPX4 | IPX4 | IPX4 | IPX4 | IPX4 | IPX4 |
| Rated Electrical Power (W) | 130 | 130 | 130 | 175 | 175 | 175 |
| Heating Flow/Return Connection | G3/4 | G3/4 | G3/4 | G3/4 | G3/4 | G3/4 |
| Gas Connection | G3/4 | G3/4 | G3/4 | G3/4 | G3/4 | G3/4 |
| DHW Inlet/Outlet Connection | G1/2 | G1/2 | G1/2 | G1/2 | G1/2 | G1/2 |
| Concentric Flue Dimensions (mm) | Φ60/100 | Φ60/100 | Φ60/100 | Φ60/100 | Φ60/100 | Φ60/100 |
| Overall Dimensions (L×W×H) (mm) | 660×370×240 | 660×370×240 | 660×370×325 | 660×370×325 | 740×510×330 | 740×510×330 |
| Energy Efficiency Class | Class 2 | Class 2 | Class 2 | Class 2 | Class 2 | Class 2 |
| Thermal Efficiency (%) | ≥90 | ≥90 | ≥90 | ≥90 | ≥90 | ≥90 |
