Best Tankless Water Heater Service Companies in Maryland Ranked

Upgrading to a tankless water heater is a smart investment for Maryland homeowners seeking endless hot water and improved energy efficiency. Unlike traditional storage tank models, these on-demand systems heat water only when you need it, which can reduce energy consumption and free up valuable space in your basement or utility closet. Finding a qualified professional for installation or repair is crucial, as the process involves complex plumbing, gas, and electrical work that must comply with Maryland's specific building codes. This guide will help you understand the key considerations, costs, and steps involved in switching to or maintaining a tankless system in the Old Line State.

Wes Plumbing & Mechanical

8612 Saxon Cir, Nottingham, MD 21236

Wes Plumbing & Mechanical is a family-owned plumbing and mechanical service provider located in Baltimore, MD. Serving both residential and light commercial customers, they offer a wide range of plumbing services including water heater repair and installation, sewer line video inspections, drain cleaning, sump pump repair, and gas line installation. The company is equipped with advanced tools such as sewer line cameras and pro press technology to efficiently address plumbing issues, especially in older homes. Established in 1982, Wes Plumbing & Mechanical brings over 75 years of combined experience to its work.

5.0

281 Reviews

Modern Plumbing Systems

baltimore

Modern Plumbing Systems is a plumbing company based in Baltimore, MD, specializing in water heater repair, installation, and replacement. They also offer services for tankless water heaters, sump pump repair, and leak detection. The company provides expertise in selecting and installing various types of water heaters, including standard tank, tankless, and hybrid heat pump models. With over 25 years of experience in the plumbing industry, Modern Plumbing Systems is led by a licensed master plumber and offers after-hours emergency service to address urgent plumbing needs.

5.0

198 Reviews

Old Line Plumbing

baltimore

Old Line Plumbing is a commercial and residential plumbing company based in Baltimore, MD. They provide a wide range of plumbing services including water heater repair and installation, drain cleaning, sewer line repair, sump pump repair, leak detection, repiping, gas line installation, and backflow testing. The company handles new construction and renovation projects for both commercial and residential clients, with capabilities such as camera inspections and installation of tankless water heaters. Master Plumber Jay Eckstorm leads the team with extensive experience and specialized training, bringing a high level of expertise to their work.

5.0

189 Reviews

Hardy Plumbing | Emergency Plumber, Drain Cleaning, Pipe Repair, Tankless Water Heater Repair and Replacement in Towson MD

8517 Loch Raven Blvd, Towson, MD 21286

Hardy Plumbing is a locally owned plumbing company serving Baltimore, MD, and nearby areas including Towson, Timonium, and Parkville. They provide a range of services such as emergency plumbing, water heater repair and installation, drain cleaning, leak detection, water softener installation, and repiping. With over 15 years of experience led by Master Plumber Justin Perkins, Hardy Plumbing emphasizes honest, thorough work and customer comfort. They offer emergency plumbing services to address urgent issues and prevent further property damage.

5.0

148 Reviews

DRAIN MASTERS (Plumbing & Drain Cleaning)

baltimore

DRAIN MASTERS (Plumbing & Drain Cleaning) provides a range of plumbing services in Baltimore, MD, including residential and commercial plumbing, water heater repair, and sewer line services. They specialize in diagnosing and repairing water heaters, including tankless models, and use advanced technology for sewer line inspections and repairs. The company offers 24/7 emergency plumbing services for urgent issues, ensuring support at any time.

5.0

97 Reviews

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Understanding Tankless Water Heater Options

The first step in your project is choosing the right type of on-demand water heater for your Maryland home. The two primary fuel sources-gas and electric-have distinct requirements and performance characteristics.

Gas Tankless Water Heaters are the most common choice for whole-home applications, especially in larger households. They provide a high flow rate, making it possible to run multiple showers and appliances simultaneously. However, they require an adequate gas supply; many installations necessitate upgrading to a larger gas line to meet the unit's demand ^{1 2}. Proper venting for combustion gases is also critical, using materials like PVC or stainless steel that meet code requirements ^{1 3}.

Electric Tankless Water Heaters are often more compact and can be easier to install since they don't require gas lines or complex venting. They are excellent for point-of-use applications (like a single bathroom or kitchen) or smaller homes with lower simultaneous hot water demand. The major consideration is electrical capacity: these units require dedicated, high-amperage 240-volt circuits, which may require a panel upgrade ^{1 4 5}.

The Installation Process: What to Expect

A professional tankless water heater installation is a multi-step process that typically takes a skilled technician between 4 to 8 hours for a standard replacement. For complex jobs involving significant upgrades, it can take longer ^{1 6}.

1. Preparation & Removal: The technician will start by shutting off the home's water supply and the power (breaker) or gas line to the old heater. The existing unit is drained, disconnected, and safely removed ^{1 7}.
2. Mounting & Rough-In: The new tankless unit is securely mounted to a wall stud. This is when any necessary infrastructure upgrades happen, such as running a new gas line, installing new electrical wiring, or setting up venting pathways for a gas model ^{1 4}.
3. Connection: The water lines (cold water in, hot water out) are connected. For gas models, the gas line is carefully connected and tested for leaks. For electric models, the dedicated circuit is wired. Venting pipes are assembled and sealed for gas units ^{1 7}.
4. Testing & Commissioning: Once everything is connected, the system is powered up. The technician will check for water and gas leaks, verify proper venting, test the flow rate, and ensure the unit ignites and heats water correctly. They will also often walk you through the basic controls ^{1 4}.

Maryland Codes, Permits, and Local Requirements

Adherence to local building and plumbing codes is not just a formality-it's essential for safety, efficiency, and insurance compliance. In Maryland, a permit is usually required for installing a new tankless water heater or replacing an old one with a different type or location ^{1 8}.

Key code considerations include:

• Venting: Gas tankless heaters have strict venting codes to safely exhaust combustion gases. The type (direct vent, power vent) and material (often listed PVC or stainless steel) must be approved ^{2 3}.
• Gas Line Sizing: Upgrading the gas line to a larger diameter is one of the most common and critical requirements for gas installations to ensure adequate pressure and volume ^{1 2}.
• Electrical Compliance: Electric installations must follow the National Electrical Code (NEC), which may involve installing new breakers and heavy-gauge wiring ^{1 2}.
• Local Amendments: Always check with your county or city building department. Baltimore City, Montgomery County, and other jurisdictions may have specific amendments or requirements beyond the state code ⁹.

Cost Breakdown for Installation in Maryland

The total cost for a tankless water heater installation in Maryland can vary widely, typically ranging from $2,400 to over $8,000, with an average often falling between $4,000 and $6,000 for a whole-home gas system ^{1 6 10}. This total encompasses several components:

• Equipment Cost: The unit itself can range from $250 for a basic electric point-of-use model to over $3,600 for a high-capacity, premium gas model ^{6 11}.
• Labor Cost: Professional installation labor generally costs between $1,000 and $5,000+. This is where complexity plays a major role. A simple "like-for-like" electric replacement will be on the lower end, while a gas installation requiring a new gas line, new venting, and a permit will be at the higher end ^{6 12 10}.
• Additional Materials & Upgrades: These are often the variable costs that impact the budget most significantly. This category includes new gas piping, venting kits, electrical circuit upgrades, water line modifications, and the permit fees themselves ^{1 3}.

Essential Repair and Maintenance

While known for their durability, tankless water heaters are complex appliances that may require professional repair. Common issues include error codes due to mineral scale buildup (especially in Maryland's areas with hard water), ignition failures, or problems with the flow sensor or control board. A certified technician can diagnose and resolve these issues to restore your hot water ¹.

Preventative maintenance is key to longevity and efficiency. The most critical task is an annual flushing to remove mineral deposits. This involves circulating a descaling solution (often a mild acid) through the unit's heat exchanger. Neglecting this can lead to reduced efficiency, higher energy bills, overheating, and premature failure. A professional maintenance visit typically includes this flushing, along with cleaning the water filter and checking the venting system ¹.

Choosing the Right Professional for the Job

Given the technical and regulatory complexity, selecting the right installer is paramount. Look for a licensed Maryland plumber or HVAC contractor who specifically lists tankless water heater experience. They should be familiar with local code requirements in your county and willing to pull the necessary permits. Ask for references, verify insurance, and ensure they provide a detailed written estimate that breaks down equipment, labor, materials, and permit costs. A reputable professional will assess your home's specific needs-including water usage, fuel type, and existing infrastructure-before recommending a model.

Frequently asked questions

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