A condensing gas combi boiler that provides space heating and domestic hot water in a single closed unit. Model W1P28-C combines a condenser-type hot water heat exchanger, digital controls, LCD display and multiple safety protections for residential use.
Heating system: rated heat input 11.2–28 kW, rated heat output 9.6–25 kW. DHW system: rated heat input 5.4–28 kW, rated heat output 4.9–25 kW.
DHW flow at ΔT = 25 K: 14 kg/min. DHW flow at ΔT = 30 K: 11.6 kg/min.
Thermal efficiency is ≥90% for both heating and domestic hot water systems. The product lists an energy efficiency value of about 90.2%.
Designed for natural gas (12T) with rated gas pressure 2000 Pa and an applicable pressure range of 1500–3000 Pa. Maximum natural gas consumption is 2.94 m³/h. The unit is described as suitable for many gas types—confirm compatibility and adjustment with your installer.
Supply: 220 V, 50 Hz. Rated electric power 130 W. Bath preheating 180 W. Minimum heat load electric power 120 W. Standby power (when WiFi not configured) 1.7 W.
Dimensions (L×W×H): 740 × 420 × 317 mm. Net weight: 37.5 kg. Gross weight: 41 kg.
Heating system maximum water pressure: 0.3 MPa. Domestic hot water system applicable pressure: 0.02–0.8 MPa. Expansion tank pre-charge pressure (with 6 L tank): 0.1 MPa.
Heating (radiators/heat sink): 30–80 °C. Floor heating: 30–60 °C. Domestic hot water: 35–60 °C.
Coaxial supply/exhaust pipe dimensions: Φ100 mm / Φ60 mm. Maximum coaxial run length specified as 3 m. The boiler has a balanced (closed) combustion chamber — install per local code and manufacturer instructions.
Anti-freeze protection, flame-out protection, overheat protection, self-diagnosis, digital control, and closed-system operation. Electrical protection: Class I and IPX4 (splash-resistant) rating.
Gas connection: G3/4. Heating flow and return: G3/4. Bath hot and cold water: G1/2. Ensure correct thread types and use a qualified installer for plumbing connections.
The unit has digital control and multiple control modes and appears to support WiFi/remote features. Standby power is specified as 1.7 W when WiFi is not configured; contact the supplier for available remote-control modules and setup instructions.
Annual servicing by a qualified technician: check condensate drainage, clean/replace filters, inspect seals and burners, test safety devices, verify expansion tank pressure, and descale heat exchangers if water hardness requires it.
The product lists an energy efficiency rating of level 2 and electrical protection Class I / IPX4. Warranty details are not provided in the spec sheet—contact the manufacturer or your dealer for warranty terms, local certifications and compliance documentation.
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