Tankless Water Heater Installation, Repair, Replacement, and Maintenance

A properly selected tankless water heater can deliver continuous hot water without storing dozens of gallons in a conventional tank. When the system is correctly sized and installed, it heats water as fixtures and appliances call for it, helping reduce standby energy loss while freeing up valuable space.

Prime Plumbing installs, repairs, replaces, and maintains tankless water heaters throughout Central Maryland. We work with gas and electric systems, specialize in gas tankless equipment, and install trusted brands such as Navien and Rinnai. Whether you are converting from a storage tank, troubleshooting an existing unit, or scheduling preventive service, we can evaluate the complete system and recommend a practical solution for your home.

Complete Tankless Water Heater Services

Tankless systems require more than simply connecting a new appliance. Proper performance depends on the unit’s capacity, available fuel or electrical service, water flow, venting, plumbing configuration, and installation quality.

Our tankless water heater services include:

• New tankless water heater installation
• Tank-to-tankless water heater conversion
• Tankless water heater replacement
• Gas tankless water heater service
• Electric tankless water heater service
• Tankless water heater repair and troubleshooting
• Tankless water heater flushing and descaling
• Preventive tankless water heater maintenance
• System sizing and installation planning
• Navien and Rinnai tankless water heater service

We assess the equipment and its supporting connections so the solution addresses the cause of the problem, not only the immediate symptom.

Tankless Water Heater Installation

Tankless water heater installation begins with determining how much hot water the household needs at one time. The correct unit must be able to support the expected flow from showers, faucets, dishwashers, washing machines, and other fixtures that may operate simultaneously.

Before recommending equipment, we consider factors such as:

• Household size and hot-water usage
• Number of bathrooms and hot-water fixtures
• Required flow rate and temperature rise
• Gas or electric service capacity
• Existing water-line configuration
• Venting and combustion-air requirements
• Indoor or outdoor installation options
• Available installation space
• Condensate drainage for condensing models
• Manufacturer installation requirements

Prime Plumbing installs both gas and electric tankless water heaters, with particular experience in gas-fired systems. We can explain the differences between available models and help you select equipment suited to your home rather than relying on a one-size-fits-all recommendation.

Converting From a Tank to a Tankless Water Heater

Replacing a conventional water heater with a tankless model may require changes beyond the water connections. Depending on the equipment and the home, the project could involve gas-line modifications, new venting, an electrical circuit, condensate drainage, or plumbing adjustments.

We inspect the existing setup before installation and explain which improvements are necessary. If the home’s current infrastructure cannot support the proposed unit efficiently, we can discuss other equipment sizes or water heater options before work begins.

Gas and Electric Tankless Water Heaters

Gas tankless water heaters are commonly selected for whole-home applications because they can provide high heating capacity. Proper installation requires adequate fuel supply, compatible venting, combustion air, and safe exhaust routing. Homes with undersized or outdated fuel piping may require gas line service as part of the conversion.

Electric tankless water heaters do not require gas piping or combustion venting, but whole-home models can place substantial demand on an electrical system. Available amperage, panel capacity, circuit requirements, and expected hot-water demand should all be evaluated before choosing an electric unit.

Neither option is automatically best for every home. The right choice depends on the property, available utilities, desired flow rate, installation scope, and long-term operating priorities.

Tankless Water Heater Replacement

Tankless water heaters can provide years of reliable service, but no unit lasts indefinitely. Replacement may become the more practical option when an older system requires frequent repairs, can no longer meet the home’s hot-water demand, or uses components that are obsolete or difficult to obtain.

Possible reasons to replace a tankless water heater include:

• Recurring shutdowns or error codes
• Increasingly frequent repairs
• A leaking or damaged heat exchanger
• Declining hot-water output
• Significant internal scale or corrosion
• Unavailable replacement components
• An improperly sized existing unit
• Changes in household hot-water demand
• Interest in a newer, more efficient model

We evaluate the condition, age, repair history, and capacity of the existing equipment before recommending replacement. When a repair remains reasonable, we will explain that option. When replacement offers better long-term value, we can help select a correctly sized system and update incompatible connections as needed.

Tankless Water Heater Repair

A tankless unit may continue running even when an internal or installation-related problem is limiting its performance. Changes in water temperature, flow, sound, or operating behavior should be investigated before the issue leads to repeated shutdowns or loss of hot water.

Schedule tankless water heater repair if you notice:

• No hot water
• Water that never becomes hot enough
• Hot and cold temperature fluctuations
• Reduced hot-water pressure or flow
• Delayed ignition
• Unexpected system shutdowns
• Recurring manufacturer error codes
• Unusual burner or operating noises
• Water leaking near the unit
• Discolored water or unusual odors
• A system that cannot support normal household demand

These symptoms can have different causes. Depending on the system, diagnosis may involve checking water flow, inlet filters, ignition components, burners, sensors, electrical connections, fuel supply, venting, condensate drainage, internal scale, and manufacturer fault codes.

We troubleshoot the complete tankless system before recommending a repair. This helps distinguish an equipment failure from a flow restriction, maintenance issue, utility problem, installation defect, or household-demand issue.

Common Tankless Water Heater Repairs

Tankless water heaters contain controls and safety components that coordinate water flow, ignition, combustion, and temperature. A failure in one part of that sequence can prevent the system from producing consistent hot water.

Repairs may involve:

• Ignition and flame-sensing components
• Flow sensors and switches
• Temperature sensors
• Inlet filters and water-flow restrictions
• Control boards and electrical connections
• Gas valves and burner components
• Venting or exhaust problems
• Condensate drainage
• Pressure-relief components
• Leaking fittings or internal connections

The appropriate repair depends on the model, fault code, system condition, and results of testing. We do not assume that every loss of hot water requires replacement.

Tankless Water Heater Maintenance and Flushing

Tankless water heaters are low-profile systems, but they are not maintenance-free. Minerals can accumulate inside the heat exchanger as water passes through it. Over time, that scale can restrict flow, interfere with heat transfer, reduce performance, and place additional stress on the equipment.

Tankless water heater maintenance may include:

• Flushing and descaling the heat exchanger
• Cleaning the water inlet filter
• Inspecting burners and ignition components
• Checking venting and exhaust connections
• Inspecting gas and water connections
• Checking for leaks or corrosion
• Inspecting the condensate system on condensing models
• Reviewing stored or active error codes
• Testing water temperature and flow
• Confirming normal system operation

Maintenance frequency depends on the manufacturer, model, water quality, and amount of use. Many systems benefit from annual professional service, while homes with mineral-heavy water may require more frequent attention. We can evaluate the system and recommend a schedule based on its actual condition rather than applying the same interval to every home.

If mineral accumulation is a recurring concern, we can also discuss whether water treatment could help address the water conditions affecting plumbing fixtures and equipment throughout the home.

Navien and Rinnai Tankless Water Heaters

Prime Plumbing installs tankless water heaters from Navien and Rinnai, two established manufacturers offering systems for a range of household sizes and hot-water demands. Available options include high-efficiency condensing units, models designed for different installation locations, and systems with manufacturer-specific controls and features.

Brand is only one part of choosing a tankless water heater. The model must also provide the required flow rate and temperature rise while remaining compatible with the home’s fuel supply, electrical capacity, venting, and plumbing configuration. We consider those requirements before recommending equipment.

What to Expect During Tankless Water Heater Service

Our process is designed to identify what the home and system actually require.

1. Evaluate the Hot-Water System

We inspect the existing equipment, relevant plumbing connections, available utilities, venting, installation location, and household hot-water needs.

2. Explain the Findings

We identify the problem or installation requirements and explain the available options. For replacement projects, this includes equipment sizing and any supporting modifications the installation may require.

3. Complete the Approved Work

We perform the installation, repair, replacement, or maintenance service authorized by the homeowner. Our licensed technicians work carefully and protect the surrounding area while service is underway.

4. Test System Operation

After the work is complete, we check water temperature, flow, connections, controls, and normal operating behavior. For a new system, we also review basic operation and maintenance considerations with the homeowner.

Tankless Water Heater Service Across Central Maryland

Prime Plumbing provides tankless water heater installation, repair, replacement, and maintenance throughout Baltimore City, Baltimore County, Anne Arundel County, Howard County, Carroll County, and Harford County.

Homes across Central Maryland vary widely in age, plumbing configuration, available fuel service, and hot-water demand. We account for those differences when sizing equipment, planning a conversion, diagnosing performance problems, or maintaining an existing unit.

Schedule Tankless Water Heater Service

Whether you need a new tankless water heater, help with an error code, replacement of an aging unit, or preventive flushing, Prime Plumbing is ready to evaluate the system and explain your options.

Schedule tankless water heater service in Central Maryland and get a solution based on your home’s hot-water demand, existing equipment, and installation requirements.