9002514B water pump for webasto heater

What is the 9002514B Water Pump?

The 9002514B water pump is the OEM-spec coolant circulation pump used in Webasto gasoline and diesel parking heaters and water heater systems. Often called the “coolant pump” or “circulation pump,” the 9002514B is responsible for moving hot coolant from the Webasto heater’s heat exchanger into the vehicle’s interior heater core, the domestic hot water loop (in RV and marine applications), and back to the burner unit. Without a working water pump, your Webasto heater cannot deliver heat to the cabin, defrost the windshield, or supply hot water — even if the burner, glow plug, and fuel pump are all functioning perfectly.

At IntelliGenParts, we stock the 9002514B as a direct, OEM-compatible replacement for Webasto installations. It is electrically and dimensionally interchangeable with the genuine Webasto part, plugs into the existing harness without modification, and is rated for the same 12V DC operating voltage, flow rate, and duty cycle as the original. Whether you maintain a single van, an RV fleet, or a commercial service shop, the 9002514B is the workhorse coolant pump you want on the shelf.

Primary Applications

• Webasto Thermo Top C (TTC) — gasoline and diesel variants
• Webasto Thermo Top E (TTE) — gasoline and diesel variants
• Webasto Thermo Top Z (TTZ) — gasoline and diesel variants
• Webasto Thermo Top V (TTV) — higher-output variant
• Webasto Air Top 2000 STC (with water heat exchanger integration)
• Webasto DBW 2010 / DBW 2016 / DBW 2020 — water heaters for marine and RV use
• Webasto Thermo 90 / Thermo 120 / Thermo 230 / Thermo 300 (in certain coolant-loop configurations)

Compatible Webasto Models (Cross-Reference)

The 9002514B is cross-referenced against several Webasto part numbers commonly used in the same coolant circulation role. Before ordering, always confirm the part number stamped on your existing pump and the heater model printed on the data plate of your unit (typically located on the side or top cover of the heater).

Technical Specifications

• Part Number: 9002514B (supersedes earlier 9002514A revision)
• OE / OEM Reference: Webasto 9002514B
• Operating Voltage: 12V DC (nominal 13.5V operating range)
• Current Draw: approximately 1.5 A at 12V
• Flow Rate: 1500 L/h (liters per hour) at nominal pressure
• Maximum Pressure: 0.8 bar
• Connector Type: 2-pin sealed automotive connector
• Hose Barb Size: 16 mm (5/8″) outer diameter, smooth barb
• Weight: approximately 0.4 kg (0.88 lb)
• Operating Temperature Range: -40°C to +110°C ambient (coolant up to 130°C)
• Duty Cycle: continuous (designed for sustained heater operation)
• Ingress Protection: IP44 minimum (splash-resistant)
• Certifications: CE, RoHS

Installation Guide

Estimated install time: 25–40 minutes for a first-time installer; 10–15 minutes for an experienced tech. Tools required: a set of screwdrivers, pliers, a small drain pan, and fresh coolant (Webasto-recommended or OEM-equivalent).

Step 1 — Disconnect the Battery

Before any work on the heater coolant system, disconnect the negative terminal of your vehicle battery. This prevents the Webasto from being commanded on during service and avoids any short-circuit risk on the 12V pump harness.

Step 2 — Allow the System to Cool Completely

Safety warning: the Webasto coolant loop runs hot. Coolant inside the heat exchanger and pump housing can exceed 100°C (212°F) immediately after the heater has been running. Wait a minimum of 30 minutes after the last heat cycle, and confirm with a temperature gun or by carefully feeling the upper radiator hose. The hose should be cool to the touch before you proceed.

Step 3 — Drain the Coolant (Optional but Recommended)

Place a clean drain pan under the heater. Open the bleeder screw or disconnect the lower hose at the heater’s return port. Capture the coolant for reuse if it is clean and less than two years old. If you are only replacing the pump itself (and not flushing the heat exchanger), draining 1–2 liters is sufficient.

Step 4 — Remove the Old Pump

Loosen the hose clamps on both the inlet and outlet of the 9002514B. Gently twist and pull each hose off the pump barbs. Do not pry with a screwdriver, as this can damage the hose ends. Disconnect the 2-pin electrical connector by depressing the locking tab and pulling straight out. Unbolt the pump from its mounting bracket (typically two 10 mm bolts) and remove the unit.

Step 5 — Compare the Old and New Pump

Hold the new 9002514B next to the old pump. Verify the connector pinout, hose barb diameter, and mounting hole pattern match. If anything is different, stop and contact us before proceeding — do not force a part that does not match.

Step 6 — Install the New Pump

Bolt the new 9002514B into the mounting bracket (snug, do not over-torque). Reconnect the 2-pin connector until you hear the locking tab click. Slide each hose back onto the corresponding barb and re-tighten the hose clamps. The flow direction is marked on the pump body with an arrow — make sure it points in the correct direction (typically from the heater outlet toward the cabin heater core).

Step 7 — Refill, Bleed, and Test

Refill the coolant to the proper level. Run the Webasto through a full heat cycle to bleed trapped air from the loop. Most Webasto systems self-bleed within one or two 20-minute cycles. Top off the coolant reservoir as needed. Check all hose connections for leaks while the system is under operating pressure. Reconnect the battery and clear any stored fault codes (see the “Common Symptoms” section below for typical error codes).

Common Symptoms of a Failing 9002514B

The 9002514B typically fails in one of three modes: electrical (motor burnout), mechanical (impeller wear or seizure), or seal (coolant leak). Here are the symptoms most owners report before a complete failure.

Symptom 1 — No Heat Output, Heater Cycles Without Warming Cabin

The burner ignites, the glow plug heats, fuel is delivered, but the cabin never warms. The pump is either not running (electrical failure) or running without flow (seized impeller).

Symptom 2 — Coolant Leak at the Pump Body

You see a small puddle of coolant on the floor under the heater, or you smell sweet coolant while the system is running. The internal shaft seal has failed.

Symptom 3 — Whining, Grinding, or Buzzing Noise from Heater Area

A failing bearing or worn impeller produces a high-pitched whine or grinding noise. The noise usually changes with engine RPM on the TTV variant, or is constant on the 12V coolant pump.

Symptom 4 — Webasto Error Code 00103 / 00014 / 00015

These codes indicate a coolant temperature sensor out-of-range or overheating condition. A failed pump is one of the top three causes, alongside a stuck thermostat and an air pocket in the loop.

Symptom 5 — Repeated Auto-Shutoff After 2–3 Minutes

The heater starts, runs briefly, then shuts off. The control module has detected an abnormal temperature rise and entered protection mode. A sluggish or partially failed pump is a common root cause.

Why Choose IntelliGenParts’ 9002514B

• OEM-compatible: identical dimensions, connector, and flow characteristics to the genuine Webasto part.
• 12-month warranty: if the pump fails under normal use within one year, we replace it.
• $45 vs $85 dealer price: you save roughly 47% on every replacement without sacrificing quality.
• In stock in our North American warehouse: most orders ship within 24–48 hours.
• DDP shipping to USA and Canada: no surprise customs or duties at the door.
• Bulk pricing for service shops: volume discounts available at 10+ units.
• 30-day returns: if the part does not fit your application, send it back for a full refund.

Compatible Vehicles

The 9002514B coolant pump is found in a wide range of European vans, light trucks, RVs, and specialty vehicles equipped with Webasto parking or water heaters.

• Mercedes-Benz Sprinter (all generations, factory Webasto)
• Volkswagen Crafter / LT
• Ford Transit (with Webasto auxiliary heater)
• MAN TGE, TGL, TGM (cabin pre-heat applications)
• Iveco Daily (with Webasto Thermo Top)
• Renault Master, Opel Movano, Nissan NV400
• Various European RV builds (Hymer, Knaus, Dethleffs, Pilote, Bavaria Camp)
• Marine vessels with Webasto DBW series water heaters
• Overland and expedition vehicles (van conversions, 4×4 campers)

Cross-References and Related Parts

When replacing the 9002514B, many service technicians also inspect and proactively replace these related parts.

• Glow plug: Webasto 1317518A (Thermo Top C/E/Z)
• Fuel pump: Webasto 22451901 (12V metering pump)
• Combustion air fan: Webasto 9002871A (Thermo Top C)
• Coolant hose set: aftermarket 16 mm ID silicone or EPDM
• Coolant: Webasto-recommended Glysantin G40 or equivalent
• Hose clamps: constant-tension 18–22 mm stainless

Need Help Identifying Your Part?

If you are not sure whether the 9002514B is the correct pump for your Webasto heater, send us a photo of the data plate on the side of the heater and a photo of the existing pump. We will confirm compatibility within one business day, free of charge.