The Clock Is Already Running
Standard tank water heaters run 8 to 12 years. Gas models sit on the shorter end. Electric units edge closer to 12 to 15 years under good conditions.
Tankless systems, including brands like Bradford White and Navien, are built differently. With proper maintenance they reach 15 to 20 years. Some even push past 25.
What Missoula’s Water Does to Your Unit
Missoula’s water carries mineral content that causes sediment buildup inside your tank year after year. According to Rheem’s 2024 lifespan research, that buildup forces the unit to work harder and can cut its life by 2 or more years.
Watch for these signals:
- Rumbling or popping sounds during heat cycles
- Rust toned water from your hot tap
- Inconsistent hot water pressure through the house
- Any unit over 10 years old running rough
Key Takeaway: Annual tank flushing is the single highest return maintenance job a homeowner can do.
Tank vs. Tankless
Type | Lifespan | Key Consideration |
Gas Tank | 8 to 12 years | Lower upfront cost |
Electric Tank | 10 to 15 years | Works without gas line |
Tankless Gas | 15 to 25 years | Requires annual descaling |
Shops like Garden City and Hellgate will replace your tank unit on that standard 10-year cycle. At Right Now Plumbing and Heating, we install Bradford White and Navien tankless systems built to outlast that cycle by a decade.
Repair or Replace
Repair makes sense when the unit is under 7 years old and the issue is easily fixed. Past the 10-year mark with repair costs climbing above 50% of a new unit’s price, replacement wins.
One of our Google Business Profile reviewers said:
“If I could give this company more than five stars, I would! They showed up on time, explained everything, gave me a good price on the work, and did a great job!”
We Serve All of Missoula
From the Rattlesnake to Lolo and Florence, we give you a real assessment. If your unit has life left we’ll elongate it.
Frequently Asked Questions
How do I know my water heater is close to failing?
Watch for rusty hot water, loud sounds during heat cycles, or inconsistent temperatures in a unit older than 10 years.
Does Missoula’s water quality shorten a water heater’s life?
Yes. Local mineral content builds up inside your tank and can trim 2 or more years off the lifespan without flushing.
Is a tankless water heater worth the cost in Montana?
For most homeowners staying in place more than five years, a Navien tankless unit pays for itself given time.
When does repair stop making financial sense on an older unit?
When the unit is past 10 years old and the repair cost exceeds 50% of a replacement.
How often should I flush my water heater?
Once a year is the standard.
Written by the owner of Right Now Plumbing and Heating, serving Missoula, Montana and surrounding communities.
Citations:
- Rheem Manufacturing (2024). Tank vs. Tankless Water Heater Lifespan Comparison. rheem.com
- A.O. Smith (2024). How Long Do Water Heaters Last. hotwater.com
- Water System Wiki (2025). Average Water Heater Lifespan Guide. watersystemwiki.com