Spheros 11113279B Coolant Circulating Pump U4814 24V | Fits Webasto DBW 2010/2020 & Thermo 300 | Replaces 66804B and 43152D($299.95Value)

Description

Verified Fitment: Heavy-duty "U4814" series coolant circulating pump designed fit for Webasto and Spheros commercial heater systems. Standard equipment on Transit Buses and Motorcoaches using DBW 2010, DBW 2020, Thermo 230, Thermo 300, and Thermo 350 heaters. High-Flow Performance: The Aquavent 5000 (U4814) delivers a high flow rate (approx. 5,000 L/h) to ensure consistent heat distribution in large commercial vehicles. Essential for preventing heater overheating and maintaining engine block temperature. Technical Specifications: Voltage: 24 Volts DC; Power Consumption: ~104W; Flow Rate: 5000 l/h against 0.2 bar. Features a durable brush motor and magnetic drive design or heavy-duty mechanical seal depending on the specific revision generation. Cross-Reference Reliability: Direct OEM replacement for discontinued Webasto / Spheros part numbers: 66804B, 66804A, 43152D, 431.52D, and 11113279A. Fits standard mounting brackets for the U4814 pump series. Application Note: This is a 24-Volt Pump strictly for commercial applications (MCI, Van Hool, New Flyer, Prevost). It is NOT compatible with 12-Volt systems found in standard school buses or light-duty RVs.

Spheros 11113279B Coolant Circulating Pump U4814 (24V)

The Spheros 11113279B (also referenced as U4814 or Aquavent 5000) is the industry-standard coolant circulation pump for heavy-duty transit and coach heaters. Designed for 24-Volt systems, this pump moves a high volume of coolant through the heater and engine block, ensuring the Webasto DBW or Thermo series heater operates within safe temperature limits without cycling on high-limit faults.

Commercial Fitment

Standard replacement for 24V hydronic heating systems in:
Transit Buses: New Flyer, Nova Bus, Gillig (equipped with 24V systems).
Motorcoaches: MCI, Van Hool, and Prevost commercial chassis.
Heater Models: Webasto DBW 2010, DBW 2020, Thermo 230, Thermo 300, Thermo 350.

Verified Part Number Cross-Reference

• Replaces Spheros / Valeo: 11113279B / 11113279A
• Replaces Webasto: 66804B / 66804A
• Replaces Older Number: 43152D / 431.52D
• Model Designation: U4814 / Aquavent 5000

Technical Specifications

• Voltage: 24V DC
• Flow Rate: ~5000 Liters/Hour
• Inlet/Outlet: 38mm (1.5") Standard Hose Barb connection