Written by Amanda Casteel · COO Reviewed by Johnny Casteel · CEO · Master Plumber Updated 2026-07-17 VA Plumbing Lic. 2710075081 · Contractor Lic. 2705180998
What actually moves the price
Gas line sizing
Undersized gas lines for tankless are the #1 range-pusher in older DMV homes.
Venting runs
Long or complex vent paths move you toward the high end quickly.
Code & condensate
Condensate drains, electrical, and inspection sequencing vary by jurisdiction.
How to read a quote
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Tankless (gas), including venting
$3,500 – $13,000 installed
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Diagnostic / service visit
VA $75 (waived with repair) · DC/MD $150 — see service-call page
Prefer a service page first? Open the matching bookable service · NoVA plumbing costs hub · Free second opinion.
FAQs
Can you give an exact tankless conversion cost price over the phone?
Only a ballpark. Honest pricing needs diagnosis — access, material, and code items. We quote flat-rate on site before work.
Do you publish starting prices?
We explain the drivers and ranges on this page and confirm a written flat-rate after we see your home. Second opinions welcome.
Where do you serve?
Arlington, Alexandria, Fairfax County, and mapped MD/DC corridors. Confirm your address when you book.
Want a real number for your home?
Call (703) 214-2551 or request service — we diagnose first and quote flat-rate before work whenever the fault is clear.