A tankless water heater provides efficient, endless hot water—but only when installed and serviced by a qualified professional. From correct venting and gas sizing to electrical safety, precision plumbing keeps these high-tech systems running at peak performance.
At Newman’s Plumbing Service and Repair, our licensed plumbers specialize in tankless water heater installation and care for homes across Hampton Roads. We understand how to size, mount, and maintain both gas and electric units so you get reliable hot water without wasted energy or surprise breakdowns.
This guide walks you through how a tankless water heater plumber works, what to expect during installation, key maintenance routines, and common repair needs. You’ll learn how to protect your investment and keep water heating efficient for years.
What a Tankless Water Heater Plumber Does
A tankless water heater plumber manages the full job of replacing or installing on-demand water heaters. They handle gas, electric, and hybrid units, arrange permits, and coordinate extra electrical or gas work when needed.
Energy Efficiency Benefits of Tankless Systems
According to the U.S. Department of Energy, tankless water heaters can be 8%–34% more efficient than conventional storage units, depending on household usage. These systems heat water only when you need it, avoiding standby losses that waste power.
Proper sizing and installation are essential. When the flow rate or temperature rise is miscalculated, efficiency drops and comfort suffers. Working with a trained plumber ensures the system meets your family’s demand and saves energy long-term.
Overview of Professional Services
A tankless water heater plumber assesses your home’s water use, plumbing, and gas or electrical capacity. They measure flow rates and temperature rise to select the right-sized unit for your needs.
When you search for “tankless water heater plumbers near me,” expect them to offer site surveys and written estimates.
On install day, the plumber removes the old heater, runs new water lines, and mounts the tankless unit. For gas models, they install proper venting, gas shutoff valves, and a sediment trap. For electric models, they confirm the right voltage and circuit size.
After hookups, the plumber tests for leaks, checks combustion (for gas), and sets controls. They explain routine maintenance tasks you can do and register the product with the manufacturer.
Qualifications of Licensed Plumbers
Licensed plumbers meet state or local trade board standards, including apprenticeships, exams, and ongoing education on codes and safety. When you hire licensed plumbers, you get proof of insurance and a license number you can verify with local authorities.
They know permit rules for water, gas, and electrical changes. Plumbers follow local building codes and warranty requirements, so your unit stays covered. Ask to see their license, insurance, and references before they start work.
Many plumbers also carry specialty certifications from manufacturers or industry groups for tankless systems. These credentials show experience with specific brands and can speed up troubleshooting or warranty claims.
Plumbers Versus Electricians for Installation
Plumbers handle water and gas line work and final system testing. If your home needs electrical upgrades for an electric tankless unit, a licensed electrician must run the dedicated 240 V circuits and subpanel wiring.
For gas units, plumbers coordinate with the gas utility if meter or line upgrades are required. Both trades often work on larger jobs: a plumber ties the unit into your pipes and installs venting; an electrician completes the power connections and safety interlocks.
If you search “plumbers near me” for a tankless job, ask whether they subcontract electricians or work with a preferred local electrician. Clear coordination avoids delays. Confirm who pulls permits, who tests the system, and who provides the final paperwork for inspections and warranties.
Choosing and Installing a Tankless Water Heater
Choose the right size unit, correct fuel type, and safe venting to get reliable hot water and keep your home safe. Plan for gas line or electrical upgrades, measure peak flow needs, and pick installers who follow local codes.
Pre-Installation Inspection and Sizing
Start with a site visit. Measure incoming water temperature, count simultaneous fixtures, and note where the unit will mount. A plumber checks wall studs, nearby gas lines, and access to an exterior wall or roof for venting.
Calculate the required flow rate by adding GPM for items you use at the same time (showers ~2.5 GPM, dishwasher ~1.5 GPM, washing machine ~2 GPM).
Also, calculate temperature rise: desired output (usually 120°F) minus groundwater temp. These numbers tell you the minimum capacity the tankless system must deliver.
Check utility capacity. For gas models, confirm your meter and pipe size can handle 150,000–200,000 BTU. For electric units, verify your panel can supply multiple 240V circuits or needs a service upgrade. Note permit and inspection needs before work begins.
Selecting Between Gas and Electric Models
Decide based on fuel availability, peak demand, and installation cost. Gas tankless water heaters provide higher flow and better temperature rise in cold climates. They often need larger gas lines and stainless steel venting.
That adds to installation cost but suits whole-house systems. Electric tankless water heaters are simpler to vent and can be cheaper to buy.
They require heavy 240V wiring and often a panel upgrade for whole-house units. Electric models work well for point-of-use or lower-demand homes. Hybrid approaches, like a gas whole-house unit plus small electric boosters, can solve distant-bathroom problems.
Ask tankless water heater installers about warranties, local code requirements, and whether the unit needs a sediment filter or water softener. Compare lifecycle costs, not just sticker price.
Understanding Flow Rate and Household Needs
Flow rate (GPM) determines if the unit keeps up when multiple fixtures run. List typical simultaneous uses in your home and add their GPM. Use the highest expected total as your target capacity.
Match that GPM to a unit’s rated flow at your calculated temperature rise. For example, a unit delivering 6 GPM at a 50°F rise may not suffice in cold climates requiring a 70°F rise. Check manufacturer charts and have installers verify the math for your groundwater temperature.
Pressure and pipe size also matter. Narrow or corroded pipes reduce flow. Install isolation valves, a sediment filter, and consider a mixing valve to prevent scalding from high output temperatures.
Safe Installation and Ventilation Requirements
Follow strict venting rules for gas tankless systems. Use approved Category III stainless steel venting or manufacturer-specified concentric vent kits. Place terminal exits away from windows, air intakes, and property lines as codes require.
Ensure adequate combustion air. Some models need direct intake piping; others require clearance around the unit. Seal wall penetrations and use proper flashing to prevent water intrusion.
Hire licensed plumbers and electricians for gas and high-amperage electrical work. Pressure-test the gas line and have electrical circuits inspected. Keep carbon monoxide detectors nearby and register the installation with local inspectors to meet permit and warranty terms.
Types of Tankless Water Heaters
You’ll see units that differ by how they use heat and where they serve your home. Pick based on fuel type, installation limits, and how much hot water you need at once.
Non-Condensing Units
Non-condensing tankless water heaters heat water with a hot flue gas that vents outside. They use a single heat exchanger made of stainless steel or copper. These units are simpler and usually cost less up front than condensing models.
They work well if you have a gas tankless water heater and a suitable venting path. Expect lower efficiency because much heat escapes through the exhaust. That means slightly higher operating costs compared with condensing units, especially in colder climates.
Maintenance is straightforward: keep the heat exchanger clean and inspect the venting. If you want faster payback and have a lower initial budget, non-condensing can be a practical choice for whole-home or point-of-use installs.
Condensing Units
Condensing tankless water heaters capture extra heat from exhaust gases and use a second heat exchanger to warm incoming water. This design raises efficiency and cuts fuel use. A condensing tankless heater saves more energy, especially with high hot water demand.
You must handle condensate with a drain and use corrosion-resistant materials. Condensing units typically cost more to buy and install, but they lower monthly bills and can qualify for rebates in some areas. They work best where winter performance matters and you run multiple fixtures at once.
Service needs include checking condensate lines and flushing the heat exchanger to prevent scale. If long-term efficiency and lower operating cost matter to you, a condensing model is worth considering.
Whole-Home vs. Point-of-Use Systems
Whole-home tankless water heaters supply hot water to all fixtures from one unit. Choose a higher flow-rate gas or electric tankless water heater to handle simultaneous uses—showers, dishwasher, and laundry.
Sizing matters: plumbers measure peak gallons per minute (GPM) and temperature rise to match a unit to your needs. Point-of-use systems sit near a single faucet or bathroom. They deliver nearly instant hot water and reduce wasted cold-water runs.
These electric or small gas tankless units work well for remote bathrooms, additions, or to supplement a main unit when demand spikes.
You can mix approaches: install a whole-home unit for main loads and point-of-use units for distant bathrooms. This setup gives you endless hot water where you need it and can cut wait time and water waste.
Tankless Water Heater Maintenance and Repairs
Keep your tankless unit clean, checked, and serviced to avoid cold showers and costly fixes. Regular care focuses on flushing mineral buildup, checking vents and gas lines, and repairing worn parts when needed.
Routine Maintenance Tasks
You can do several simple maintenance tasks yourself every few months. Check and clean the inlet water filter to remove sediment. Wipe down exterior vents and air intakes to keep airflow steady.
Schedule an annual professional service to inspect the heat exchanger, burner, and gas or electrical connections. A plumber tests the pressure relief valve, cleans fan blades, and verifies safe venting. Keep receipts and service dates so you know when the next visit is due.
Use a checklist to track tasks:
- Clean the inlet filter
- Inspect venting and exhaust
- Verify water pressure and flow
- Record service date and notes
Descaling and Handling Hard Water Issues
If your home has hard water, scale builds up inside the heat exchanger and reduces efficiency. Descalcify your tankless water heater at least once a year with a vinegar or manufacturer-recommended descaling solution. In very hard water areas, plan for descaling every 3–6 months.
A plumber can set up a pump-and-bucket flush, remove scale safely, and inspect the heat exchanger for damage. Consider installing a whole-house water softener or a point-of-use filter to reduce future buildup. This saves energy and extends the life of your tankless water heater.
Common Repairs and Troubleshooting
You’ll likely face a few issues: no hot water, reduced flow, error codes, or strange noises. Start basic—check the power supply or gas, clear the inlet filter, and confirm vents are not blocked. Reset the unit only after checking the manual.
Call a plumber when you see persistent error codes, gas smells, leaks around the unit, or if the burner or heat exchanger shows rust.
Typical repairs include replacing sensors, ignition components, or descaling when scale has caused heat exchanger damage. Keep the model and serial number handy before calling for faster service.
Importance of Regular Inspections
Regular inspections catch small problems before they become big repairs. A yearly inspection by a licensed plumber confirms safe gas lines, proper venting, and correct combustion. It also validates warranty requirements for many tankless water heater services.
Inspections let the plumber spot corrosion, loose connections, or failing parts early. You’ll get a service report with recommended fixes and an estimated timeline. This helps you budget for repairs and keeps your unit running reliably.
Benefits and Considerations of Tankless Systems
Tankless systems save energy by heating water only when you need it and free up floor space compared with tank water heaters. Weigh higher installation costs and maintenance needs against lower operating bills and a longer service life.
Energy Efficiency and Cost Savings
A tankless system heats water on demand, so it avoids the standby heat loss that a tank water heater has. This can cut your energy use by 8–34% for typical households, depending on how much hot water you use. If your home uses under ~40 gallons a day, savings are usually larger.
You may save about $100 per year for a family of four, but your exact number depends on local fuel prices and how often multiple outlets run at once.
Expect higher upfront costs for the unit and installation; converting from a tank can add $1,000–$3,000 or more if you need new venting or electrical work. Also, budget for annual descaling in hard water areas; skipping it reduces efficiency and can void warranties.
Lifespan and Space Requirements
Tankless units usually last 15–25 years, while tank water heaters last 8–12 years. A longer life can reduce replacement frequency and long-term cost, especially if you plan to stay in your home.
A wall-mounted tankless system takes up much less space than a bulky tank. That frees the basement or garage floor area for storage or other equipment. Place the unit close to frequent hot water outlets to reduce wait time and heat loss.
Comparing Tankless and Tank Water Heaters
Tank water heaters store 40–50 gallons of hot water and deliver it instantly until the tank runs low. That means faster initial delivery, but you may run out during back-to-back showers.
Tankless systems provide endless hot water at a controlled flow rate. They can struggle if multiple showers and appliances run at once, unless you size the system correctly or install multiple units. Tanks need less frequent service, but can corrode and leak over time.
Tankless units need regular flushing to prevent mineral buildup. Choose based on your household’s peak hot-water needs, space, and whether you prefer lower ongoing energy bills or a lower initial price.
Reliable Hot Water Through Professional Expertise
A tankless water heater performs best when installed, maintained, and repaired by experts who understand flow rates, venting, and water quality. Consistent service prevents scale buildup, improves efficiency, and ensures safe operation for your family.
Newman’s Plumbing Service and Repair offers specialized tankless water heater solutions throughout Hampton Roads. We handle everything from precise installations to full-system descaling and inspections.
Their technicians bring brand-specific training and dependable service that keeps your water hot year-round. Learn about upgrading or servicing your tankless water heater: schedule a consultation or visit our website for a professional assessment tailored to your home.
Frequently Asked Questions
Find answers about cost, who can service the unit, service frequency, benefits, maintenance tips, and how to choose the right model. Each answer gives practical details you can use when planning installation or upkeep.
What’s the average cost of installing a tankless water heater?
A basic electric tankless unit and a simple swap can cost $800–$1,500 for parts and labor. Gas models and complex installs—like adding new gas lines, venting, or electrical upgrades—typically run $2,000–$6,000 total. Get at least two written estimates from licensed plumbers to see exact local prices and permit fees.
Can tankless water heaters be serviced by any plumber?
Not always. Any licensed plumber can handle basic plumbing hookups, but tankless systems need techs familiar with gas line sizing, venting, and manufacturer service procedures.
Ask the plumber about their experience with your exact brand and model. Request proof of training or past tankless jobs.
How often should a tankless water heater be serviced?
Most manufacturers recommend a basic inspection every 12 months. Descaling (flush and vinegar or descaling solution) is usually needed every 6–12 months in hard-water areas. Follow the owner’s manual for your model.
What are the benefits of upgrading to a tankless water heater?
You get on-demand hot water and a smaller unit size. You can save energy if your household uses less hot water than a tank’s standby heat loss would waste. Many tankless units also last 15–20 years with proper care.
Are there any maintenance tips for tankless water heaters?
Flush the unit to remove mineral buildup once a year or more in hard-water areas. Replace the water and air filters per the manual and check the venting, gas line, and electrical connections during each service. Keep the area around the unit clear.
What should I consider before choosing a tankless water heater?
Calculate your peak flow rate (gallons per minute) for times when you use multiple fixtures, like showers and the dishwasher. Match this number to the unit’s GPM rating at your incoming water temperature.
Choose between gas or electric models based on fuel availability and cost. Consider installation costs for venting or electrical upgrades. Check warranties and ask about local service options.
