How much does a tankless water heater cost in Maryland?

Let me cut to the answer so you can decide whether to keep reading: tankless water heater installation in Maryland, in 2026, costs between $3,895 and $7,495 for a gas tankless install at our fixed published prices — net of roughly $1,400 in stacked rebates, that lands at a real-world net price of $2,745 to $6,345.

That's our pricing. Elsewhere in Montgomery County, you'll see quotes ranging from $2,400 (suspiciously low, usually missing permits or using off-brand equipment) to $9,500 (plumbers who don't actually specialize in tankless and pad the quote to be safe). The rest of this guide walks you through why those wildly different numbers exist — and which one reflects what the work actually costs.

What you're actually paying for

A proper tankless install includes ten distinct components. Each costs real money; a "cheap" quote usually just means one or more got skipped.

1. The unit itself. A quality condensing tankless from Rinnai, Navien, or Rheem runs $1,400-$2,600 for the unit alone. Off-brand imports exist at $600-$900, but we won't install them and neither should you.
2. Permit and inspection. Montgomery County charges a permit fee, and the work must be inspected. This is $75-$200 in direct cost plus our time to pull it and coordinate inspection — about $350 in total value.
3. Labor — 6 to 8 hours, two techs. At realistic DMV trade rates, this is $900-$1,400 of pure labor.
4. Venting. Concentric PVC vent + fittings for a standard 15-20 ft run: $150-$300 in materials.
5. Gas connection. Isolation valve, drip leg, flex connector, sediment trap: $85-$150 in parts.
6. Water connections + service valves. Isolation valves and service valves that make future descaling easy: $180-$280.
7. Condensate line. High-efficiency condensing units produce condensate that needs to drain somewhere: $60-$120 in materials.
8. Old tank removal and disposal. $75-$200 depending on the dump fee schedule.
9. Initial flush kit. Hardware that lets you descale the unit annually: $95-$140 installed.
10. Rebate paperwork and follow-through. Four different rebate forms, tax-credit documentation, warranty registration: 2-3 hours of administrative time.

Add those numbers up: $3,395 to $5,490 in genuine cost for a quality install. A $2,400 quote is cutting corners — often on the permit, the brand, or the warranty support.

The four rebates that bring your net price down

This is the part most Montgomery County homeowners don't know to ask about. For natural-gas tankless installs qualifying for Energy Star certification (which every unit we install does), four incentives stack:

Rebate	Amount	Source
Washington Gas tankless rebate	Up to $450	Applied to invoice at install
Maryland manufacturer rebate	$100	Manufacturer check, 6-8 weeks
Federal tax credit (25C)	Up to $600	Tax filing year of install
Montgomery County property tax credit	Up to $250	Property tax bill credit
Total stackable	Up to $1,400	—

For an Essential tier install at $3,895, a fully stacked $1,150-$1,400 rebate drops your net out-of-pocket to around $2,745. That's less than most homeowners pay for a like-for-like tank replacement from a big-name plumber. Full details on our rebates page.

The three stipulations most likely to change your price

Our fixed tiers cover the overwhelming majority of Montgomery County homes. The three add-ons that do sometimes apply:

Gas meter upgrade ($195 coordination fee). High-BTU tankless units need at least a 250 CFH gas meter. Older Rockville and Bethesda homes occasionally have a 175 CFH meter that Washington Gas needs to swap. We coordinate the swap — the utility does the work at no direct charge.

Extended venting (+$8/ft beyond 20 ft). If the unit can't be mounted within 20 ft of an exterior wall, additional concentric vent runs cost $8 per foot. This is the most common add-on we see — usually adding $40-$80 total.

Thermal expansion tank (+$175). Montgomery County code requires an expansion tank on closed systems (homes with a check valve or PRV at the main water line). About half of newer homes need one. We install it at consult if required.

Financing, if you'd rather spread the cost

Wisetack offers 0% APR for 12 months on balances up to $10,000 with a soft credit check that doesn't affect your score. For Essential tier installs, that's roughly $324/month for a year — less than most Montgomery County homeowners currently pay for the standby heat loss from their old tank.

Longer-term financing through GreenSky extends to 60 months at competitive fixed APRs. Most Signature tier installs on 60-month terms land around $95-$130/month.

When tankless doesn't save you money

We'll be honest: tankless isn't always the math-positive choice. If you:

• Plan to sell within 3 years (you won't recoup through energy savings)
• Live alone with minimal hot water use
• Don't have natural gas service
• Have an all-electric home and a finished basement (heat pump water heaters may be a better electric option)

...then a like-for-like tank swap at $1,800-2,200 is usually the rational choice. We'll tell you this at consult if we see it — we'd rather pass on a job than recommend something that doesn't fit.

The bottom-line answer

For a typical 3-bedroom, 2.5-bathroom Montgomery County home with natural gas service: expect to pay $3,895 to $5,295 gross, $2,745 to $4,145 net of rebates, and recoup the difference vs. a tank through energy savings and avoided replacement within 12-15 years. For larger Potomac or Bethesda estates with 4+ baths: plan on $5,295 to $7,495 gross, $4,145 to $6,345 net.

Ready for your specific number? Run the 30-second instant estimator on our homepage — it'll tell you your tier, your price, and your rebate stack before you talk to anyone.