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Tankless water heaters costs in Maryland
Tankless water heater cost in Maryland
Tankless quotes in Maryland range from three thousand dollars to nine, for what looks like the same appliance. The appliance is not the variable. The gas line, the venting route and the condensate drain are, and the only way to read a tankless quote is to see those three as separate numbers.
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Quick answer
How much does a tankless water heater cost in Maryland?
A tankless water heater in Maryland costs $3,000 to $6,000 installed where the gas line and venting are already adequate. Where the gas branch has to be upsized or re-run from the meter, the total reaches $4,500 to $9,400. The condensing unit itself is $3,200 to $5,400 installed; gas, venting, condensate and isolation valves are priced on top and should appear as their own lines.
The numbers
Maryland pricing, broken down.
Almost no contractor site in this market publishes a number, which is exactly why the question has so much search demand and so little honest supply. These are the ranges we price to in Maryland, with the reason each one is a range and not a price.
Typical in Maryland
Tankless water heater, installed
$3,000 – $6,000
Condensing tankless unit, installed
$3,200 – $5,400
The unit, the mounting, the water connections and the commissioning. This assumes the gas and the vent route are already workable.
Total installed where gas and venting are adequate
$3,000 – $6,000 installed
The same band the water heater replacement guide quotes. A straight swap of an existing tankless lands at the bottom of it.
Total installed with new gas run and venting
$4,500 – $9,400
The honest upper case for a house whose gas piping was sized for a tank. Every element of it is itemised in the rows below.
Gas branch upsizing, short run
$450 – $1,100
Where the existing half-inch branch cannot deliver the 150,000 to 199,000 BTU a tankless asks for at the appliance.
New gas run from the meter
$1,200 – $3,400
Length, route, and whether the run passes through finished space. The meter occasionally needs the utility rather than us.
Sidewall venting and penetration
$480 – $1,150
Concentric or two-pipe polypropylene, the penetration, flashing, and the clearances a termination needs from windows and soffits.
Condensate drain and neutraliser
$220 – $560
A condensing unit produces acidic condensate. It is neutralised and drained, or lifted by a pump where no drain is in reach.
Isolation valves and sediment filter
$260 – $590
Without these the heat exchanger cannot be descaled. In Maryland hard water that is the difference between fifteen years and eight.
Electric tankless, point of use
$600 – $1,900 installed
Sensible for a single remote fixture. Not a whole-house answer in Maryland — the winter temperature rise asks for an electrical service most houses do not have.
Descaling, per visit
$185 – $340
Annual in hard water, every two years where the water is softened. This is the running cost a tank does not have.
High-efficiency tank instead, for comparison
$1,400 – $3,100 installed
Included deliberately. Where the gas work is heavy, a tank is the cheaper and often the better answer, and a quote should say so.
Permit and inspection
$75 – $250
Gas and venting work is inspected. Varies by jurisdiction within our eight-county area.
Ranges, not quotes. Published 2026 and reviewed against work we are actually pricing in Maryland. What your job costs comes from a walkthrough — access, condition, height and finish level move a price more than square footage does. Estimates are free and in writing.
The three questions that decide the price
Can the existing gas line feed it, can it be vented where it needs to sit, and is there a drain for the condensate. Those three answers move a tankless installation across a six thousand dollar range, and every one of them can be established in a single visit before any money is committed.
That is why a tankless quote given over the phone is not a quote. A contractor who has not looked at the gas piping, the meter and the proposed vent route is guessing, and the guess resolves itself as a change order once the work has started.
Our written estimate puts the appliance on one line and each of those three on their own, so the decision to proceed is made with the real total visible rather than the headline figure.
Tankless against a high-efficiency tank, honestly
Tankless wins on endless hot water, on floor space, and on service life. A well-maintained unit runs toward twenty years where a tank is replaced at eight to twelve. It also fails gracefully more often than a tank does, because a tank failure is a flood and a tankless failure is usually a fault code.
A tank wins on installed cost, on simplicity, and on tolerance of hard water and neglect. It has no descaling schedule, no condensate to manage and no gas sizing question. Where the gas branch needs re-running, the tank is cheaper by several thousand dollars and will not be noticeably worse at the job the household actually asks of it.
The decision is not about which appliance is better in the abstract. It is about what this house already has in the wall. A quote that recommends tankless without having checked the gas line is selling an appliance rather than solving a problem.
What running one costs after the installation
Gas use falls, because nothing is kept hot while the house is asleep or at work. The saving is real but modest in a typical household, and it does not on its own repay a heavy gas installation inside a decade.
Against that, budget a descaling visit at $185 to $340, annually in hard water. Skipping it is the single most common reason a tankless unit underperforms in year five, and the scale damage is not covered by the appliance warranty.
Filters need rinsing, and the condensate neutraliser media is replaced periodically. None of this is onerous, but it is a maintenance relationship a tank does not ask for, and it belongs in the comparison.
Before you sign anything
What a real written quote should itemise
Ask every contractor for these in writing. Quotes only compare once they do — and Maryland law requires home improvement work over $500 to be under a written contract anyway.
- The unit make, model, and the flow rate stated at a winter temperature rise rather than a nominal one
- A statement of the existing gas pipe size and length, and whether it is adequate as it stands
- Gas upsizing or a new run from the meter priced as its own line, with the route described
- Venting type, the route to the outside, and where the termination lands relative to windows and doors
- Condensate drain or pump, and the neutraliser
- Isolation valves and a sediment filter, both fitted at installation
- Permit and inspection, with the jurisdiction named
- The descaling interval this unit needs in local water, and what a visit costs
- A priced high-efficiency tank alternative, so the comparison is on the same sheet of paper
- Appliance warranty and labour warranty, as separate figures
Want the number for your house?
Call and describe the job. You’ll get a straight answer on whether it’s something we do and roughly what it runs, before anyone books a visit.
(301) 524-1729
Priced by us, not a calculator
Plumbing
What moves the number
Why two quotes on the same job land far apart.
Usually not because one contractor is expensive. Usually because they are pricing different work. These are the variables that actually move it.
01
What the existing gas line can deliver
This is the first question and usually the most expensive answer. A tank draws modest gas over a long period. A tankless unit draws a great deal for the minutes it runs, and the pipe has to be sized for that instantaneous demand along its whole length. A house with a short run of three-quarter-inch pipe is ready. A house with a long half-inch branch is looking at $450 to $3,400 of gas work before the heater is touched.
02
Where the unit can be vented
Tankless units vent through a sidewall, which is one of their advantages, but the termination has to clear windows, doors, soffits and property lines. A unit on an interior wall needs a vent route to the outside, and that route through finished space is what pushes the venting line toward the top of its range.
03
Winter temperature rise, not the badge rating
The gallons-per-minute figure on a tankless unit is quoted at a modest temperature rise. Maryland groundwater in February arrives cold, and the same unit delivers meaningfully less hot water then than it does in August. Sizing on the February rise is what prevents the complaint that two showers cannot run at once.
04
Water hardness and the cost of ignoring it
Much of our area has hard water. Scale forms on a tankless heat exchanger and the unit loses efficiency before it loses function. Annual descaling at $185 to $340 keeps it honest, which is why isolation valves are fitted at installation rather than retrofitted later at a cost that exceeds them.
05
How long you intend to stay
A tankless unit lasts longer than a tank, and that longer life is most of the financial case. Where the gas work is light and the household will be there fifteen years, the arithmetic works. Where the gas work is heavy or the house is being sold within five, a high-efficiency tank is the better purchase and we will say so in writing.
Straight answers
Tankless water heaters cost questions
Not covered here? Call and ask — you’ll get a real answer, not a “depends on the job”.
Because they are not quoting the same work. The unit and its installation are $3,200 to $5,400 almost everywhere. The variation is the gas line — $450 to $1,100 to upsize a short branch, $1,200 to $3,400 for a new run from the meter — plus venting and condensate. Ask for those as separate lines and the quotes become comparable.
Not on gas savings alone within a short horizon. The financial case rests mostly on service life: fifteen to twenty years against eight to twelve for a tank. Where gas work is light and you are staying, that works. Where the gas line needs re-running, it generally does not.
Often yes, and it frees the floor space. The constraints are gas capacity at that point, a workable sidewall vent route, and somewhere for the condensate to drain. All three are checked on site before the unit is ordered.
Annually in hard water, which covers much of Frederick County, and every two years where the house has a softener. A visit runs $185 to $340. It is only possible if isolation valves were fitted at installation, which is why we fit them as standard.
Rarely in Maryland. The winter temperature rise means a whole-house electric tankless unit asks for an electrical service most houses here do not have. Electric tankless is a good answer for a single remote fixture at $600 to $1,900 installed, not for the house.
While the crew is there
The trades that usually come with it
Talk to the people doing the work
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Tell us what needs doing. We’ll walk it with you, sequence every trade it touches, put the price in writing, and leave you to decide.
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