Tankless Water Heater Installation cost: Brentwood vs Hilo (2026)
The two metros aren't quite in sync on tankless water heater installation: Brentwood sits 5% below Hilo, or roughly $4,100 versus $4,300 — about $200 apart.
Brentwood TN
Lower costTypically around $4,100
Hilo HI
Typically around $4,300
Brentwood vs Hilo: full breakdown
| Factor | Brentwood | Hilo |
|---|---|---|
| Typical 2026 cost | $4,100 | $4,300 |
| Estimated range | $2,550–$5,600 | $2,700–$5,850 |
| Labor index (vs US) | ×0.97 | ×1.04 |
| Climate zone | Mixed | Hot |
| Climate factor | ×1 | ×0.98 |
| Local permit | $150 | $150 |
| Labor share | $2,250 | $2,350 |
| Materials/equipment | $1,850 | $1,950 |
Tankless water heater installation numbers here are 2026 planning ranges, adjusted per city — useful for budgeting, not a substitute for an actual quote.
How much should this gap actually matter?
At 5%, this gap is small enough that it's usually swallowed by normal quote-to-quote variation for tankless water heater installation — focus on the contractor, not the city.
Tankless water heater installation by type: Brentwood vs Hilo
Below, each tankless water heater installation option is priced independently for both cities, with identical local labor, climate and permit logic applied — so the comparison holds up.
| Type | Brentwood | Hilo |
|---|---|---|
| Gas tankless | $3,050–$6,450 | $3,200–$6,750 |
| Electric tankless | $1,800–$3,250 | $1,900–$3,400 |
These are 2026 planning figures for tankless water heater installation, localized to each city — not formal quotes.
Tankless water heater installation by flow rate (GPM): Brentwood vs Hilo
Tankless units are sized by flow rate — gallons per minute (GPM) — rather than tank size. Add up the fixtures you'd run at once: a shower is ~2 GPM, so a larger household needs a higher-GPM unit (or two).
| Size | Brentwood | Hilo |
|---|---|---|
| 5–7 GPM (1–2 people, 1 bath) | $2,300–$4,200 | $2,400–$4,400 |
| 7–9 GPM (2–3 people, 2 baths) | $2,650–$4,900 | $2,800–$5,150 |
| 9–11 GPM (3–4 people, 2–3 baths) | $3,050–$5,400 | $3,200–$5,650 |
| 11+ GPM (5+ people / whole-home) | $3,550–$5,850 | $3,700–$6,150 |
Tankless water heater installation numbers here are 2026 planning ranges, adjusted per city — useful for budgeting, not a substitute for an actual quote.
What water heaters pros earn in each metro
Roughly 55% of what you pay for tankless water heater installation is labor, which is why local wages explain most of the price gap. The numbers below are actual metro wages for skilled installers, sourced from BLS OEWS — not guesses.
Nashville-Davidson--Murfreesboro--Franklin metro · about 6% below the US average installer wage.
No BLS metro wage series for Hilo; we use Hawaii regional price parity instead.
Source: U.S. Bureau of Labor Statistics, OEWS metro wages for HVAC installers (used as a trade-labor index).
Cheapest time for tankless water heater installation in either city
Wait for a winter failure and you're paying rush rates on a unit already past 10 years, when the cold incoming water finally does it in. Replace it on your own schedule in spring or fall and you avoid that premium entirely.
Tank or tankless — and what should you budget?
Three formats, three very different cost profiles. Our editors on how to decide which one actually fits your household.
The simple-swap case
If your current tank suits your household and the budget is tight, a like-for-like tank replacement is the cheapest, fastest job — no gas-line or panel upgrades, done in a morning.
The tankless case
Tankless costs more upfront and may need a gas-line or electrical upgrade, but it lasts longer, never runs out of hot water and trims standby energy loss — strongest for larger households planning to stay put.
The heat-pump case
A heat-pump (hybrid) water heater costs the most upfront but slashes operating cost and earns the strongest utility rebates where offered — the long-run winner where the install location suits it.
The right format depends on how long you're staying and what you're optimizing for: upfront cost favors tank, convenience favors tankless, and long-run savings favor heat-pump.
Brentwood vs Hilo
Is tankless water heater installation cheaper in Brentwood or Hilo?
Brentwood comes out ahead here, at roughly $4,100 for tankless water heater installation compared with $4,300 in Hilo — a 5% ($200) gap as of 2026.
Why does tankless water heater installation cost more in Hilo than Brentwood?
Labor rates explain most of it — 1.04 in Hilo vs 0.97 in Brentwood. A hot climate versus mixed accounts for the rest.
How much is tankless water heater installation in Brentwood, TN?
Expect to pay $2,550 to $5,600 for tankless water heater installation in Brentwood in 2026, averaging around $4,100.
When is the cheapest time to buy tankless water heater installation — and does it differ by city?
Timing doesn't change by city here — Spring and early fall is the cheapest window in both Brentwood and Hilo, saving roughly 5–10%. Avoid deep winter (failure season) in either location, when emergency replacements push prices up.
Should I choose where to live based on tankless water heater installation cost?
Probably not. Yes, $200 is a real gap, but it's a one-time cost you can partly offset in Hilo with off-season timing and tighter bids. Long-term factors like energy prices and home condition matter more than this one number.
Compare tankless water heater installation in other cities
Updated June 2026 · By Serhat Özçelik