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Hot Water Heating Condensing Gas Combi Boiler Heater

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  • Shipping Timeframes: All orders are processed within 2-5 business days (excluding weekends and holidays). After your order has been processed, the estimated delivery time is before 03 Feb, 2026, depending on customs, Please note that due to high demand, some items may experience longer shipping times, which will be communicated at order confirmation email.
  • Order Processing Time: Please allow 2-5 business days for us to process your order before it is shipped . Orders placed after 16:00 on Fridays, or during weekends and public holidays, will begin processing on the next business day. Processing times may be extended during peak seasons or sales events.
  • Manufacturing Time: Some products needs manufacturing time, the manufacturing process will take approximately 10-30 business days depending on the product. This timeframe may vary depending on the complexity of the product and current demand. but this will be communicated with you during order confirmation.
  • Returns and Exchanges: We offer a 30-day return policy for most items. If you are not completely satisfied with your purchase, you may return it within 30 days of receipt for a refund or exchange. Items must be unused, in their original packaging, and accompanied by proof of purchase. Return shipping costs are the responsibility of the customer, unless the item was damaged or defective upon arrival.
1. What is the Hot Water Heating Condensing Gas Combi Boiler Heater?

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.

2. What are the heating and domestic hot water (DHW) power ratings?

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.

3. What is the domestic hot water flow rate?

DHW flow at ΔT = 25 K: 14 kg/min. DHW flow at ΔT = 30 K: 11.6 kg/min.

4. What is the thermal efficiency of the unit?

Thermal efficiency is ≥90% for both heating and domestic hot water systems. The product lists an energy efficiency value of about 90.2%.

5. Which gases and gas pressures does the boiler support?

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.

6. What are the electrical requirements and power consumption?

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.

7. What are the physical dimensions and weight of the boiler?

Dimensions (L×W×H): 740 × 420 × 317 mm. Net weight: 37.5 kg. Gross weight: 41 kg.

8. What water pressures are required or allowed?

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.

9. What temperature ranges can I set?

Heating (radiators/heat sink): 30–80 °C. Floor heating: 30–60 °C. Domestic hot water: 35–60 °C.

10. What venting / flue requirements does the unit have?

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.

11. What safety and protection features are included?

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.

12. What pipe connections does the boiler use?

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.

13. Does the boiler support remote controls or WiFi?

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.

14. What maintenance is recommended to keep the unit operating efficiently?

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.

15. What certifications, efficiency labeling or warranty information are available?

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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