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How to Budget for a Tankless Water Heater

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How to Budget for a Tankless Water Heater

Ditch the bulky tank, spread the $2,900 cost over 15 interest-free months, and avoid the winter rush.

VoAtlas editorial Updated · 3 min read
Typical cost $2,900 before anything else
Across the 0% window $193.33/mo 15 months, no interest

How we got that: $2,900 spread evenly across the 15-month introductory window on the Discover it® Cash Back. Checked · at the bank Carry a balance past the window and the standard APR applies to what is left.

You get endless hot water and reclaim an entire closet's worth of floor space. Most swaps take a single day. Plumbers get slammed the first week temperatures plummet, so late summer is the sweet spot to book. Trades look for work before heating season madness hits, which gives you real leverage on labor rates.

Expect to pay around $2,900 for the unit, venting, gas line checks, and labor. To keep your emergency savings intact, you can break that total into predictable monthly payments without paying a dime in interest.

A 0% intro APR period is a firm deadline, not free money. If you still carry a balance when those 15 months wrap up, the card's standard variable rate kicks in on whatever is left, so stick to the $193.33 monthly schedule.

The steps

  1. 01

    Get three quotes in late summer

    Call at least three licensed plumbers in August or September before freeze emergencies monopolize their calendars. Make sure each quote includes hauling away the old tank and checking whether your existing gas supply line needs an upsizing.

  2. 02

    Check for local utility rebates

    Gas utilities and regional energy programs frequently offer rebates for switching to high-efficiency tankless models. Ask your installers which specific model numbers qualify before ordering equipment. These credits can shave hundreds off your net bill.

  3. 03

    Finance with an intro APR card

    Put the $2,900 job on the Discover it® Cash Back to get a 0% intro APR for 15 months on purchases and balance transfers. That buys you well over a year of breathing room without finance charges eating into your budget.

  4. 04

    Automate your monthly payments

    Divide the $2,900 project cost across your 15-month window to get a flat payment of $193.33 per month. Set up autopay right after the charge clears so you whittle the balance down steadily.

  5. 05

    Plan for an annual vinegar flush

    Tankless units need a quick descaling once a year to clear mineral buildup and protect the warranty. Pick up a cheap submersible pump kit and run white vinegar through the system yourself in less than an hour.

  6. 06

    Check the card terms before you commit

    Every figure we publish for the Discover it® Cash Back carries the date a person verified it against Discover and a link to where they checked. Intro windows and APRs change without notice, so confirm the current terms before applying.

    See Discover it® Cash Back terms →

Common questions

Is a gas tankless water heater worth the higher upfront cost?

Yes, if you plan to stay in your home for several years. You stop paying to keep 50 gallons of water hot all day, and tankless units last roughly 20 years compared to 10 for standard tanks.

Will my current gas line work with a tankless heater?

It depends on the unit's heating power. Tankless models draw a surge of gas the moment a tap opens, which often requires upgrading an existing half-inch pipe to a three-quarter-inch line from the meter.

How long does the installation take?

A standard changeout usually takes between four and eight hours. If the plumber needs to core new exterior holes for venting or reroute gas lines, work can stretch into a second day.

Does a gas tankless heater work during a power outage?

No, because the unit relies on an electric ignition and a digital control board. You can keep it running during blackouts by plugging the power cord into an inexpensive battery backup.