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Water heater installation costs in Maryland
Water heater installation cost in Maryland
Replacing a heater that is already there is one job. Putting a heater where there was not one, moving it, or switching the fuel it runs on is a different job with a different number, because most of the cost sits in the gas, the power, the venting and the drain rather than in the appliance. This guide prices the installation work itself.
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Quick answer
How much does water heater installation cost in Maryland?
A like-for-like water heater swap in Maryland runs $1,400 to $3,100 for gas and $1,350 to $2,600 for electric. A genuine new installation — a heater in a location that never had one, a fuel change, or a move to another part of the house — runs $2,100 to $5,600 once the supply lines, the venting, the drain and the power or gas are counted. Work is carried out with a licensed Maryland plumber and permitted.
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
New water heater installation, including supply and venting
$2,100 – $5,600
Like-for-like replacement, gas tank
$1,400 – $3,100 installed
The same fuel, the same location, the same capacity. This is the replacement case and it has a guide of its own with the full breakdown.
Like-for-like replacement, electric tank
$1,350 – $2,600 installed
Existing circuit reused. If the breaker and the wire are undersized for the new element rating, add the circuit row below.
New tank installation where no heater existed
$2,100 – $4,200
A basement utility area, an addition, a converted garage. Includes hot and cold supply, a drain or pan discharge, shut-off, expansion tank and strapping.
Tankless installation, including new gas run and venting
$4,500 – $9,400
The unit and its installation sit at $3,000 to $6,000. The spread above it is the gas and venting rows below, which is why tankless quotes vary so widely between houses.
Heat pump (hybrid) unit, installed
$2,600 – $4,800
Needs roughly 700 cubic feet of surrounding air and a condensate drain. A closet installation reaches the top of the range because ducting or a louvred door is added.
Electric to gas conversion, before the heater
$700 – $2,000
Gas piping, venting and combustion air. This is preparation work only and is on top of the heater line above.
Gas branch upsizing, short run
$450 – $1,100
Common when a tankless unit is added to a house whose gas piping was sized for a tank. A tankless needs 150,000 to 199,000 BTU available at the appliance.
New gas run from the meter
$1,200 – $3,400
Length, whether the route is open or finished, and whether the meter itself has capacity left.
Sidewall venting and penetration
$480 – $1,150
Stainless or polypropylene depending on the appliance, plus the exterior penetration, flashing and termination clearances.
Dedicated 240 volt circuit for an electric tank
$450 – $1,200
Breaker, wire and the run back to the panel. A panel with no space left is a separate electrical item we flag rather than absorb.
Condensate drain and neutraliser
$220 – $560
Required for condensing tankless and heat pump units. Where no drain is within reach a condensate pump is used.
Isolation valves and sediment filter
$260 – $590
On a tankless this is not optional in practice — without isolation valves the unit cannot be descaled, which shortens its life in hard Maryland water.
Expansion tank, pan and shut-off
$290 – $640
Current code items. Older installations frequently have none of them, which is why a compliant installation costs more than the one it replaces.
Relocating the heater to another part of the house
+$600 – $2,200
New supply runs, a new drain path and new venting. Worth it when the old location floods a finished space or blocks a remodel.
Permit and inspection
$75 – $250
Varies by jurisdiction. A water heater installation in Maryland is permitted and inspected work, and an unpermitted one surfaces at resale.
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.
Why installation and replacement are priced apart
A replacement reuses almost everything. The gas or the circuit is there, the vent is there, the supply lines land in roughly the right place, and the new unit occupies the footprint the old one did. That is why a like-for-like swap can be quoted over the phone within a reasonably narrow band, and why it finishes inside a day.
An installation has to create those connections. The cost of the appliance barely moves between the two cases — the difference is pipe, wire, vent and labour. Treating the two as one job is how a homeowner ends up comparing a two thousand dollar quote against a five thousand dollar quote and assuming someone is overcharging, when in fact the two quotes describe different amounts of work.
For a straightforward swap, the water heater replacement cost guide has the full breakdown and the repair-or-replace decision. This page is for everything else.
Sizing, and the cost of getting it wrong
For a tank, capacity follows the first-hour rating rather than the gallon figure on the label. A household of two with one bathroom is well served by forty gallons. Four people with two bathrooms and a soaking tub are not, and the usual symptom is not a cold shower but a heater that runs constantly and fails early because it never gets to rest.
For a tankless unit, the figure that matters is flow at a given temperature rise. Maryland groundwater arrives cold enough in February that a unit sized on a summer rise will disappoint in winter. Sizing is done on the coldest month, not the average.
Oversizing has its own cost. A larger tank than the house needs means more standby loss every day for the life of the appliance, and a tankless unit sized for a flow the house will never draw costs more to buy and more to vent for no benefit.
What a compliant installation includes that an old one did not
Houses in Frederick County built before the current code cycles frequently have a heater with no expansion tank, no drain pan, no seismic or lateral strapping, and a vent connector that was acceptable when it went in. A new installation brings all of that up to current requirements, and that is a real part of the difference between the old invoice and the new quote.
The items are not negotiable and not decorative. An expansion tank protects the tank and the relief valve from pressure spikes on a closed system. A pan with a piped discharge is the difference between a puddle and a ceiling. The permit and the inspection are what make those items verifiable rather than claimed.
A quote that is notably cheaper than the others is usually cheaper because one or more of these is missing. The honest way to compare is line by line, which is why our written estimates itemise them.
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 appliance make, model, capacity and first-hour rating or flow rate, not just the word gas or electric
- Where the heater will sit, and what has to be run to reach it
- Gas work priced separately: branch upsizing or a new run from the meter, with the length stated
- Electrical work priced separately: breaker size, wire size and whether the panel has capacity
- Venting type, route and the exterior termination
- Expansion tank, drain pan, piped discharge and shut-off, each listed as its own line
- Condensate drain or pump where the unit produces condensate
- Isolation valves on any tankless installation, so it can be descaled later
- Permit and inspection stated as included, with the jurisdiction named
- Removal and disposal of the old unit where there is one
- The warranty on the appliance and the warranty on the installation labour, as two 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
Whether anything has to be brought to the heater
The appliance is the predictable part. What moves an installation from two thousand dollars to five is whether gas, power, venting, water supply and a drain already reach the spot. A basement next to the existing main is cheap to serve. A second-floor laundry closet in a finished house is not, because every one of those five has to be routed through framing that is already closed.
02
The fuel you are starting from and the fuel you want
Staying on the same fuel keeps an installation in the replacement band. Changing fuel adds a preparation stage before the heater is even bought: gas piping, combustion air and venting for a conversion to gas, or a new dedicated circuit and panel capacity for a conversion to electric. Budget the conversion separately so the two decisions stay visible.
03
What the gas line can actually deliver
A tankless unit asks for more gas at once than a tank ever does. Where the existing branch is half-inch pipe on a long run, it has to be upsized or re-run, and occasionally the meter needs attention from the utility. This single fact decides tank or tankless more often than preference does, and it is the first thing worth checking before a tankless quote is taken seriously.
04
Access and the floor below
A heater in an open basement with a floor drain is straightforward. A heater in an attic, a crawl space, or above finished ceilings adds a pan, a piped discharge, and sometimes a leak sensor and shut-off valve, because the consequence of a failure there is drywall and flooring rather than a wet slab.
05
Scheduled work against an emergency
A planned installation is quoted after a look, with the unit chosen on merit and the permit filed in the ordinary way. A failed heater on a Saturday is a different transaction for every contractor in Maryland. If the heater is over ten years old, planning the work is the cheapest version of it.
Straight answers
Water heater installation cost questions
Not covered here? Call and ask — you’ll get a real answer, not a “depends on the job”.
Because the appliance is the smaller half of the cost. A replacement reuses existing gas or electrical supply, venting, water lines and a drain. A new installation creates all of them, and that pipe, wire and vent work is where the extra two to three thousand dollars goes.
It is worth it where the house has the gas capacity already, hot water demand is high or simultaneous, and the owner intends to stay long enough to use the longer service life. Where the gas branch has to be upsized or re-run, the payback stretches well past a decade and a high-efficiency tank is usually the better value.
Usually, yes. Relocation adds $600 to $2,200 on top of the installation itself, for new supply runs, a new drain path and new venting. It is still worth doing when the current location sits inside a finished space, blocks a remodel, or has no drain.
Yes. Water heater installation in Maryland is permitted and inspected work, and the permit fee of $75 to $250 is small against the cost of discovering at resale that the installation was never inspected. We file it and the inspection is included.
Water heater work is carried out with a licensed Maryland plumber, licensed through the Maryland Board of Plumbing. AS Home Solutions MD LLC is an MHIC-licensed home improvement contractor and self-performs fourteen trades; plumbing is the one we run alongside a licensed plumber rather than instead of one.
While the crew is there
The trades that usually come with it
Talk to the people doing the work
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