How much does a tankless water heater cost?

A tankless water heater runs about $1,400 to $5,000 installed, with gas conversions on the higher end because of venting and gas-line work. The unit itself is roughly $1,000 to $2,500.

Can I install a tankless water heater myself?

Swapping like-for-like is doable for a confident DIYer, but converting from a tank usually means new gas, venting, or a heavier circuit, which is advanced and code-regulated. Many DIYers do the plumbing and hire the gas or electrical.

Tankless or tank water heater?

Tankless heats on demand, saves space, lasts longer, and gives endless hot water, but costs more up front and may need gas or electrical upgrades. A tank is cheaper to install but uses standby energy and runs out during heavy use.

Does a tankless heater really give endless hot water?

Yes, it heats water as it flows, so it does not run out, but it has a flow-rate limit. Size the unit to your peak demand (showers plus appliances at once) or you can outrun a too-small unit.

How long does a tankless water heater last?

About 15 to 20 years, notably longer than a tank's 8 to 12 years, especially with annual descaling in hard-water areas. The isolation valve kit makes that flushing easy.

UPDATED JUNE 2026

Tankless Water Heater Cost in Rhode Island

Locally calibrated hire vs. DIY cost data for tankless water heater projects in Rhode Island. Cited sources, permit requirements, and a full build guide, free.

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HIRE A PRO

$1,500–$5,300

Fully installed, labor + materials

DIY COST

$1,000–$2,600

Materials + rentals, your labor free

Hard

Complex project, structural or code-critical work involved.

Government Data · Government Data · Submitted Quotes (n=0)

How we got these numbers

National benchmark costs from RSMeans, Angi, Fixr, and HomeGuide are adjusted for Rhode Island using two federal datasets: the Bureau of Economic Analysis Regional Price Parity (RPP) index and the Bureau of Labor Statistics (BLS) Occupational Employment and Wage Statistics. Rhode Island's RPP is 1.0 (national baseline = 100) and its BLS labor adjustment factor is 1.08. Higher RPP means goods and services cost more relative to the national average; the BLS factor scales contractor labor rates to local wage levels. We blend these two adjustments, weighted 40% RPP, 60% BLS labor, to produce the ranges shown above.

adjusted_cost = national_benchmark × (0.4 × RPP/100 + 0.6 × bls_labor_adj)

RPP(Rhode Island) = 1.0 · BLS adj = 1.08

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What's included

Item	Qty	Unit Cost	Subtotal
Tankless water heater unit	1 unit	$1,100	$1,100
Venting (gas) or wiring (electric)	1 set	$350	$350
Gas line upgrade or breaker	1 set	$300	$300
Valves, fittings, and isolation kit	1 set	$150	$150
Materials Total			$1,900

Tools you'll need

See the tools we'd buy →

TOOLS YOU PROBABLY OWN

Pipe wrenches and tubing tools
Multimeter and electrical tools

TOOLS TO RENT OR BUY

Drill and hole saw (for venting)

Build sequence

1
Shut off and drain the old water heater and disconnect it.
2
Confirm the gas line size or electrical capacity meets the unit's demand.
COMMON MISTAKE
Undersized gas or wiring is the top reason a tankless underperforms.
3
Mount the unit and run the new venting (gas) or circuit (electric).
4
Connect the water lines with an isolation valve kit for flushing.
5
Pressure-test, check for gas leaks, set the temperature, and verify flow.

Permits and code requirements

PERMIT REQUIREMENTS

Permit rules for tankless water heater vary by city and county in Rhode Island. Most structural, electrical, plumbing, or mechanical work needs a permit and an inspection. Confirm with your local building department, or see the Rhode Island guide for specifics.

PERMIT THRESHOLD

Varies by municipality

Disclaimer: Always verify permit requirements with your local building department before starting work. Requirements vary by municipality and are updated periodically.

Frequently asked questions

NEXT STEPS

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UPDATED JUNE 2026