The Dometic expansion tank (Part# 290000086) is a critical component in your RV water heating system that prevents pressure buildup and extends the life of your water heater. This 2.0-gallon tank accommodates thermal expansion as water heats, protecting seals and connections from damage. Essential for any RV owner maintaining their Dometic water heater system.
Key Features
- 2.0-gallon capacity for proper thermal expansion relief
- OEM Dometic part ensures perfect compatibility
- Prevents pressure-related damage to water heater components
- Direct replacement for original equipment
- Durable construction built for RV travel conditions
- Easy installation on existing water heater systems
Technical Specifications
| Specification | Details |
|---|---|
| Part Number | 290000086 |
| Capacity | 2.0 gallons |
| Manufacturer | Dometic |
| Application | RV Water Heater Systems |
| Type | Expansion Tank |
Frequently Asked Questions
Q: How do I know if my expansion tank needs replacement?
A: Signs include water leaking from the tank, reduced hot water pressure, or visible corrosion. If your water heater is cycling on and off frequently, the expansion tank may be failing.
Q: Will this tank fit my Dometic water heater?
A: This is a genuine OEM Dometic part designed for Dometic water heater systems. Verify your model number matches the compatibility list or contact our support team for confirmation.
Q: How often should I replace an expansion tank?
A: With proper maintenance, expansion tanks typically last 5-10 years. Replacement depends on water quality, usage frequency, and system maintenance.
Why Choose Elkhart RV Parts
We specialize in hard-to-find Dometic RV replacement parts and ship directly from Elkhart, Indiana—the RV capital of the world. Every part we sell is genuine OEM equipment backed by expert customer support. When you need the exact Dometic component for your water heating system, trust the specialists who know RVs inside and out.
| Brand | Dometic |
|---|---|
| Product type | Expansion Tank |
| Capacity | 2.0 Gallon |
| Part number | 290000086 |
| Compatible systems | Dometic water heaters, Atwood/Dometic models |
| Function | Maintains water pressure, prevents thermal expansion damage |
| Installation type | Inline with existing water heater system |
| Part category | OEM Replacement Part |
| Item status | New Arrival |
Factory-Fresh OEM Parts — the same brands installed in new RVs straight from Elkhart. Genuine, name-brand components made to order — never generic, never outdated. Sourced directly from the original RV manufacturers for perfect fit and factory-level quality.