Fixed pricing from $3,895 installed. We serve 1 ZIP code across Potomac — 20854 — with same-week install availability and every rebate filed for you. 46,000 residents.
Potomac has approximately 46,000 residents and a diverse housing stock — a combination that means thousands of aging 40–50 gallon gas storage tanks are hitting end-of-life at any given moment. The vast majority of those homeowners are now choosing tankless replacement rather than like-for-like tank swaps, and for good reason: endless hot water, 20+ year lifespan, and roughly $95–$200/year in energy savings per Washington Gas data.
Potomac has a high concentration of 4+ bathroom estate homes where a single tankless unit isn't enough — our Whole-Home Pro tier with dual-unit configuration is designed specifically for these installations. We've installed more dual-tankless systems in Potomac's 20854 than anywhere else in our service area.
Potomac's WSSC water is moderately hard (110–140 mg/L). Many Potomac estates also have whole-house water softeners, which actually helps tankless longevity significantly.
Potomac falls under Montgomery County permit jurisdiction. Large estates often require additional permit coordination for gas line upgrades or dual-unit installations, which we handle end-to-end.
Potomac homeowners typically request bids from multiple plumbing firms and HVAC companies. The quotes vary wildly — $4,800 to $9,500 for similar Signature-tier scope — because none of these companies specialize. Our fixed pricing removes the negotiation game entirely.
From your first consult to a hot shower is typically 8–12 business days — nearly all of which is Montgomery County permit processing time. Install day itself is a single 6–8 hour visit: we arrive around 8am, the old tank is removed by noon, and the new tankless unit is mounted, commissioned, and flushed before dinner.
We've completed installs throughout Potomac, including:
Every Potomac install falls into one of three published fixed-price tiers. See full pricing and stipulations, or use the instant estimator to see which tier fits your home.
45-minute in-home assessment. Locked-in fixed price at consult, no callbacks.
Book a consult →Every review below is from a real Potomac homeowner who approved us to publish their install. See all reviews.
"Had three Potomac plumbers give me totally different numbers for the same scope. DMV Tankless was the only one who published pricing online. The price I saw was the exact price I paid."
"Installed the Navien 240A2 with recirculation in our Potomac home. Hot water at every tap in about 8 seconds. Team was in and out in one day — old tank gone, new unit mounted, everything working."
"Best part was they handled the Montgomery County permit and Washington Gas rebate paperwork. Rebate check arrived about 6 weeks later — a real $450 I would not have bothered to file on my own."
These are the actual questions we get during Potomac consults. See the full FAQ for more.
Our three fixed tiers apply identically across all Potomac ZIP codes (20854): Essential at $3,895, Signature with recirculation at $5,295, and Whole-Home Pro at $7,495. All prices are all-in including Montgomery County permit, standard venting, gas connection, condensate tie-in, old-tank haul-away, first-year flush, and rebate paperwork. Typical Potomac homeowners qualify for $1,150–$1,400 in stacked rebates.
Install day itself is 6–8 hours. From your first consult to install is typically 8–12 business days in Potomac — the majority of that time is Montgomery County permit processing. Emergency installs (same-week) are available for a flat $395 rush fee.
Yes. Every Potomac install includes Montgomery County permit filing and inspection scheduling as part of the fixed price. Skipping the permit voids homeowners insurance coverage for water damage claims and creates issues at resale. We hand you the signed-off inspection card before we consider the job complete.
Potomac homeowners stack four rebates: Washington Gas rebate up to $450, Maryland manufacturer rebate of $100, federal tax credit of 30% (up to $600), and Montgomery County property tax credit up to $250 — totaling up to $1,400. We file every form on your behalf. See our full rebates page for details.
We install three brands in Potomac: Navien, Rinnai, and Rheem. These are the only brands with reliable parts availability, strong warranty support, and proven 20+ year longevity in DMV water conditions. We decline to install off-brand tankless units regardless of price — we won't install what we can't stand behind for two decades.
Same fixed pricing. Same published stipulations. Same next-week install availability.
Licensed master plumber verifies sizing, locks your fixed price, answers every question. Zero commitment. Most Potomac consults booked within 72 hours.