Marey water heater parts are sourced through Marey direct, authorized distributors, and (for universal components) standard plumbing supplies. Tankless and point-of-use heaters use brand-specific control boards and sensors more than tank heaters do.
Common replacement parts
Heating elements (electric models)
Marey electric tankless elements are typically 4500–18000 W per element, with multi-element configurations on whole-house units. Replacement options vary by model — most are Marey-OEM with limited aftermarket. $40–150 per element.
Heat exchangers (gas/propane models)
Copper or stainless heat exchangers are the most expensive component. Replacement: $200–600 for residential, $400–1,200 for commercial. Often the failure that triggers full unit replacement decision.
Control boards
Control boards manage flow sensing, modulation, and safety lockouts. Marey boards are model-specific — must order OEM. $150–400.
Flow sensors
Detect water flow to trigger heater activation. Common failure point — accumulates mineral scale or debris. $40–120 OEM.
Inlet screen / filter
Cleanable but eventually needs replacement. Cheap part — $15–35.
Pressure relief valve (when present)
Standard ASME-rated 3/4" NPT. Universal aftermarket fits: $15–30.
Thermocouples / thermopiles (gas pilot models)
$25–45 OEM.
Ignition modules (electronic ignition models)
$80–200 OEM.
Where to source Marey parts
Marey direct or authorized distributor
For control boards, flow sensors, heat exchangers, and other brand-specific parts. Contact Marey customer service for parts orders or referral to authorized parts distributor.
Plumbing supply houses
Ferguson, HD Supply, and Hajoca stock common universal parts. For tankless, less consistent coverage than for tank heaters.
Amazon and online specialty retailers
Common universal parts (inlet screens, generic thermocouples, T&P valves) available with quick shipping. Brand-specific parts may also be available through third-party online sellers.
Part-number matching
The data plate on every Marey unit lists the model number and OEM part numbers for critical components. Always cross-reference with the Marey parts catalog when ordering, as model variants share housings but have different internal components.
Common parts mistakes
- Buying universal heating elements that don't match the unit's exact wattage
- Installing wrong-flow flow sensors (different GPM ranges between models)
- Using aftermarket gas valves that don't communicate with the OEM control board
- Skipping the inlet screen replacement schedule (clogged screens trigger flow sensor faults)