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The real numbers behind the switch to tankless.
| Tank Water Heater | Tankless Water Heater | |
|---|---|---|
| Upfront Cost | $2,500 installed | $5,000–$7,000 installed |
| Monthly Energy Cost | $30–$50/month | $20–$35/month |
| 10-Year Total Cost | $4,800–$8,500 | $5,200–$9,700 |
| 20-Year Total Cost | $8,400–$14,500 (2 units) | $5,200–$9,700 (1 unit) |
| Lifespan | 8–12 years | 20+ years |
| Hot Water | Runs out (limited by tank) | Unlimited on-demand |
| Energy Savings | Baseline | 24–34% less energy |
| Space | Floor space (24″ × 24″+) | Wall-mounted (14″ × 24″) |
| Maintenance | Annual flush | Annual descaling |
At 20 years, tankless costs less because you don't buy a second unit. Tank owners replace once at ~10 years.
Recommended by local plumbers for King County's climate and water conditions.
11 GPM flow rate handles 3+ simultaneous fixtures. Wi-Fi enabled. Recirculation ready.
$5,500–$7,000 installed
0.96 UEF — highest in class. Dual stainless steel heat exchangers. Built-in recirculation pump.
$5,200–$6,800 installed
9.5 GPM, built-in leak detection. Strong warranty. Widely available through local suppliers.
$5,000–$6,200 installed
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Gas tankless units cost $5,000–$7,000 installed. Electric tankless runs $5,000–$7,000. The higher upfront cost is offset by 24–34% energy savings and a 20+ year lifespan — roughly half the lifetime cost of a tank.
For most Bellevue homes with 2+ bathrooms and $40+/month water heating bills, yes. You break even in 7–10 years and save significantly over 20 years since you never buy a second unit. See the cost comparison table above.
Most homes with an existing gas line can. Your plumber will check gas line size (3/4" minimum for most units), venting requirements, and electrical for the control board. Upgrades, if needed, typically add $200–$500.
Yes — as long as you don't exceed the unit's flow rate (measured in GPM). A quality unit rated at 8+ GPM handles 2–3 fixtures simultaneously. Running 4+ fixtures at once may require a second unit or a higher-capacity model.
Annual descaling (flushing with vinegar solution) to remove mineral buildup. Takes 30–60 minutes and costs $100–$200 from a plumber. Bellevue's water is moderately hard, so annual service is important for longevity.
New installation takes 4–8 hours. Converting from a tank system takes longer because the plumber may need to upgrade the gas line, install new venting, and cap off old connections. Most conversions are done in one day.
Rinnai, Navien, and Rheem are the top three for the Pacific Northwest. Rinnai RU199iN is best for large homes (11 GPM). Navien NPE-240S2 has the highest efficiency (0.96 UEF). Rheem RTGH-95DVLN is the best value.
Gas tankless units with UEF ≥ 0.82 qualify for a 30% federal tax credit up to $600/year through 2032 (IRS Form 5695). Heat pump water heaters qualify for up to $2,000. Check with your tax preparer for eligibility.
Water Heater Installation Service Near Me in Bellevue WA