Tankless Water Heaters in Allentown and Quakertown, PA and the Surrounding Areas

Fast, Licensed, Local, and Always Professional Honest Pricing for tankless heaters – 24/7

24/7 emergency dispatch

Licensed PA133897 · Insured

Allentown and Quakertown, PA and the Surrounding Areas

Our VIP plans

VIP Basic
$19.95 /month
  • Never a service fee & discounted emergency fee
  • Annual tank water heater cleaning, UV light replacement, drain cleaning, sump battery, or filters
  • Annual multi-point visual plumbing inspection
VIP Deluxe
$29.95 /month
  • Never a service fee & discounted emergency fee
  • Annual tankless water heater cleaning, or drinking water filtration serviced
  • Annual multi-point visual plumbing inspection
VIP Plus
$39.95 /month
  • Never a service fee & discounted emergency fee
  • Lifetime warranty eligible
  • Optional $10 add-ons
  • Annual multi-point visual plumbing inspection

The issues that bring most homeowners to our door, and the ones we fix every week.

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Tankless Water Heater Installation and Service in Allentown PA

Mastery Plumbing installs and services all major brands of tankless water heaters throughout Allentown, Quakertown, and the Lehigh Valley. Master plumber Dan Dunn, Pennsylvania License #PA133897, 25+ years of hands-on water heating system experience, oversees every installation from pre-installation assessment through final inspection. We size the unit correctly for your household’s peak demand, manage all permits, handle gas line and venting modifications in scope, and coordinate required inspections. Homeowners across Allentown, Quakertown, Lansdale, Doylestown, and surrounding Bucks and Montgomery County communities have trusted our honest, professional work since 2017. Browse our 4.8-star Google reviews, Yelp profile, and Houzz portfolio to see what they say. For tankless water heater services throughout Eastern PA, call 267-377-4172.

I’d highly recommend for any plumbing needs
Mastery Plumbing is fantastic! Dan Dunn was willing to step in and help one of my clients over the weekend, which shows his reliability and dedication. He’s professional, responsive, and someone I’d highly recommend for any plumbing needs.
- Shelby Krans

Why Choose Mastery Plumbing for Tankless Water Heater Installation

Why Choose Mastery PlumbingWhat It Means for You
4.8-star Google reviews, Yelp profile, and Houzz portfolio4.8 stars from 183+ verified reviews, Lehigh Valley homeowners rating real tankless water heater installations and service calls.
License PA133897 | Insured & BondedDan Dunn leads every job. Licensed master plumber with 25+ years of tankless system experience, fully insured and bonded in Pennsylvania.
Permit Management IncludedWe pull all required permits and coordinate inspections for every installation. No homeowner paperwork required.
All Major Brands InstalledRinnai, Navien, Noritz, Bradford White, A.O. Smith, Rheem, we recommend the right brand and model for your household, not a single preferred line.
Gas Line and Venting Modifications In ScopeGas supply upgrades, venting reconfiguration, and electrical modifications are included in the installation estimate, no surprise add-ons.
24/7 Emergency Response | Same-Day Service CallsCall 267-377-4172 any time for emergency hot water response. Same-day diagnostic and repair calls available throughout the service area.
Annual Descaling and Maintenance AvailableHard water scale is the primary cause of premature tankless failure. We provide annual flush service to protect your investment.
VIP Deluxe Care PlanAnnual tankless maintenance included in VIP Deluxe. Waived service fees, discounted emergency rates, and priority scheduling.

Why Tankless Water Heaters Make Sense for Lehigh Valley Homes

Tank water heaters store 40 to 80 gallons of water at a set temperature around the clock, consuming energy to reheat it repeatedly whether or not hot water is being used. The U.S. Department of Energy notes that water heating accounts for approximately 18 percent of residential energy use, and standby heat loss from storage tanks is a primary contributor. For Allentown and Quakertown homeowners looking to reduce utility bills and eliminate the recurring frustration of running out of hot water mid-shower, a correctly sized ENERGY STAR certified tankless unit addresses both problems in a single installation.

The Lehigh Valley’s older housing stock presents an additional practical argument for tankless conversion. Homes built in the 1950s through 1980s with small utility closets or finished basements often lack the floor space for a modern large-capacity storage tank. A wall-mounted tankless unit occupying a fraction of the footprint resolves the space constraint while delivering continuous hot water on demand.

Tankless vs. Storage Tank Water Heater Comparison

FeatureTankless Water HeaterStorage Tank Water Heater
Hot Water SupplyContinuous on demandLimited by tank capacity
Energy UseHeats only when neededStandby heat loss 24/7
Service Life20+ years with annual maintenance8-12 years average
Space RequiredWall-mounted, minimal footprintFloor space for 40-80 gal tank
Water Supply RiskNo tank to corrode or burstTank failure can flood home
Hard Water SensitivityScale on heat exchanger (annual flush)Scale on element and tank floor
Installation ComplexityGas/venting/electrical assessment requiredStraightforward like-for-like swap

Our Tankless Water Heater Installation Process

  • Pre-Installation Assessment: We evaluate your home’s existing gas supply, venting path, and household peak hot water demand. This determines unit sizing, any required gas line or venting modifications, and the total project scope.
  • Permit Application: Mastery Plumbing pulls all required plumbing and mechanical permits through the applicable local building authority. Homeowners do not need to manage any paperwork.
  • Installation: We remove and dispose of the existing water heater, install the tankless unit, complete all gas, venting, and water connections to code, and install any required pressure relief valve, isolation valves, and flush kit access ports.
  • Commissioning: We start the unit, verify ignition function, confirm set temperature and output temperature at fixtures, and check all connections for leaks.
  • Inspection Coordination: We coordinate the required post-installation inspection with the local building authority and confirm approved status before closing the permit.
  • Homeowner Walkthrough: We demonstrate operation, review the annual maintenance schedule, and confirm warranty registration before departure.

Tankless Water Heater Service and Repair in Allentown PA

Mastery Plumbing diagnoses and repairs all major brands of tankless water heaters throughout the Lehigh Valley. Common repair scenarios include: error code diagnostics; heat exchanger descaling on units with mineral scale buildup from hard water; flow sensor replacement; ignition assembly service; venting blockage clearing; and gas valve or pressure regulator replacement. For water heater repair calls, we carry common replacement parts for the brands most frequently installed in the area. If the unit is beyond economical repair, we provide a water heater installation estimate on the same visit.

Homes with hard water or elevated iron content in the area’s well water supply benefit from water softener installation upstream of the tankless unit to reduce scale accumulation on the heat exchanger. Mastery Plumbing provides free water hardness testing during service visits and can discuss whether pre-treatment is appropriate for your address.

When to Call Mastery Plumbing for Tankless Water Heater Service

Call 267-377-4172 for same-day tankless water heater repair throughout Allentown, Quakertown, and the Lehigh Valley. Call any time for 24/7 emergency response when a tankless unit stops producing hot water. Mastery Plumbing holds Pennsylvania Plumbing License PA133897 and is fully insured and bonded for all water heating system work. Our 4.8-star Google reviews and Yelp profile reflect 25+ years of licensed master plumber experience. Ask about our VIP Care Plans for included annual tankless maintenance and priority year-round scheduling.

Areas We Also Serve for Tankless Water Heater Service

Lansdale, Doylestown, Bensalem, Bethlehem, Norristown, Levittown, Horsham, Warrington, Warminster, Phoenixville, Pottstown, Easton, Springfield, and surrounding communities. Call 267-377-4172 to confirm availability for your address.

Schedule Your Tankless Water Heater Installation in Allentown or Quakertown PA

Mastery Plumbing (License PA133897) installs and services tankless water heaters throughout the Lehigh Valley and Bucks County. Call 267-377-4172 to schedule a pre-installation assessment or a repair service call. Ask about our VIP Deluxe Care Plan for included annual tankless maintenance, waived service fees, and priority scheduling. General water heater services, including storage tank installation, are also available for homeowners who prefer a tank replacement.

Straight answers to what homeowners ask us most. Still unsure? Call – we’re happy to talk it through.

A tankless water heater heats water on demand as it flows through the unit rather than storing a tank of pre-heated water. When a hot water tap is opened, cold water passes through a heat exchanger powered by gas or electricity and is delivered at the set temperature instantly.
The benefits of a tankless water heater for Allentown and Quakertown area homeowners include: lower energy consumption from eliminating standby heat loss; continuous hot water supply that does not deplete during heavy use; a compact wall-mounted design that frees up floor space; and a longer service life compared to storage tank heaters, typically 20 or more years with proper annual maintenance. The U.S. Department of Energy notes that tankless water heaters can be 24 to 34 percent more energy efficient than conventional storage heaters for homes that use less than 41 gallons per day.
A standard residential tankless water heater installation replacing an existing tank heater in the same location takes one working day in most cases. Installations that require gas line upgrades, new venting, or electrical service modifications take longer. Mastery Plumbing provides a realistic installation timeline during the pre-installation assessment visit and communicates in advance if the project is expected to extend beyond a single day. Most homeowners in the Lehigh Valley are back to normal hot water use by the end of the installation day.
The right size depends on peak hot water demand—number of fixtures, bathrooms, and appliances used simultaneously. Our team calculates and recommends the correct capacity.
Yes. Gas tankless heaters have a much higher BTU demand than a standard tank heater and typically require a larger gas supply line to deliver adequate fuel during operation. We assess and upgrade the gas line as part of the installation if needed.
Gas tankless water heaters require dedicated sealed venting, typically with stainless steel or PVC pipe depending on the unit. The venting requirements are different from a standard tank heater and must be properly installed for safe operation and warranty compliance.
Yes. Tankless water heater installation in Pennsylvania requires a plumbing permit and, for gas units, a mechanical permit covering the gas connection and venting. The City of Allentown, Quakertown Borough, and surrounding municipalities each issue permits through their respective building authority. Mastery Plumbing manages all permit applications and coordinates required inspections as a standard part of every tankless installation. Homeowners do not need to navigate the permit process themselves. All completed installations are inspected and approved to current Pennsylvania Uniform Construction Code standards.
ENERGY STAR certified tankless water heaters with a Uniform Energy Factor (UEF) of 0.82 or above may qualify for federal tax credits under the Inflation Reduction Act, which provides a credit of up to 30 percent of equipment and installation cost for eligible energy-efficient water heating upgrades. Pennsylvania utility companies and local programs may also offer rebates on qualifying units. Mastery Plumbing provides documentation of equipment efficiency ratings and installation costs to support homeowner applications for available incentives. Eligibility details change annually and should be confirmed with a tax professional.
Yes. Most traditional units can be replaced with a tankless model, though modifications to gas lines, venting, or electrical connections may be required.
Yes, when sized correctly. Larger households may benefit from a higher-capacity unit or two units installed in parallel. We evaluate your peak simultaneous flow demand and recommend the right capacity before installation.
Yes, tankless water heaters are compatible with well water. The primary concern with well water is mineral content, particularly elevated hardness and iron, which are common in private well water throughout Bucks County and the Lehigh Valley. Mineral scale accumulates on the heat exchanger over time and reduces efficiency and output. Annual flushing is recommended for all tankless units, and homes with hard or iron-laden well water benefit from a water softener upstream of the tankless unit to reduce scale formation and extend service life. Mastery Plumbing can assess your well water quality and recommend appropriate pre-treatment.
Once per year is recommended. Homes with hard or well water may need flushing every 6–9 months.
Most tankless water heater error codes indicate a specific condition that requires attention, such as a blocked air intake, a scale-restricted heat exchanger, a failed flow sensor, or a gas supply pressure problem. Note the specific error code displayed and consult your unit's owner's manual for the indicated condition. Do not attempt to clear a gas supply or venting error without professional diagnosis. Call [phone] to schedule a diagnostic service call. Mastery Plumbing services all major tankless water heater brands and carries common replacement parts for rapid repair.
Delay in hot water arrival is not caused by the tankless unit but by the distance between the unit and the fixture. Hot water must travel through cold pipes before it arrives. A recirculation pump or a point-of-use heater near high-demand fixtures solves this.
A cold water sandwich, where a burst of cold water follows the initial hot water, is a known characteristic of some tankless units when flow starts and stops in rapid succession. It is not a malfunction but rather a behavior caused by residual cold water in the pipes between uses.
Rapid scale buildup is a sign of very hard water. Minerals in hard water precipitate onto the heat exchanger when water is heated, reducing efficiency and eventually damaging the unit. A whole-home water softener significantly reduces the descaling frequency needed.
Tankless water heaters installed in unheated spaces, such as exterior walls, unconditioned garages, or crawl spaces, face freeze risk during Pennsylvania winters when temperatures drop below approximately 20 degrees Fahrenheit. Most modern tankless units include built-in freeze protection that activates the heating element or circulates water when the inlet temperature drops near freezing. This protection requires the unit to maintain an electrical connection. For installations in very exposed locations, additional pipe insulation and a freeze protection kit are advisable. Mastery Plumbing evaluates installation location and freeze exposure during the assessment visit.
Annual maintenance for a tankless water heater covers: descaling the heat exchanger by circulating a food-grade descaling solution through the unit; cleaning the air intake filter; inspecting venting for blockages or corrosion; checking the water and gas inlet screens; verifying ignition function; and confirming the set temperature and output pressure. This annual service interval keeps the unit operating at rated efficiency, prevents scale-related failures, and in most cases is required by the manufacturer to maintain the equipment warranty. Mastery Plumbing VIP Deluxe Care Plan includes this annual service.
Combination units, sometimes called combi systems, can provide both space heating through a hydronic baseboard system and domestic hot water from a single tankless unit. These are more complex to design and install but can be cost-effective in smaller homes.
We work with several reputable brands and recommend options based on your fuel type, household demand, and budget. We select units that have strong manufacturer support and are known for reliability and serviceability.
Yes. Tankless water heater installation in Pennsylvania requires plumbing and mechanical permits that can only be pulled by a licensed plumbing contractor. Gas connections, venting, and electrical modifications that do not meet code can create safety hazards, void the manufacturer's equipment warranty, and result in required remediation by a licensed contractor before a certificate of occupancy can be issued. Mastery Plumbing holds Pennsylvania Plumbing License PA133897 and handles all permitting, installation, and inspection coordination as a standard part of every tankless installation project.
A condensing tankless water heater extracts additional heat from the exhaust flue gases by cooling them below the dew point, causing them to condense and release latent heat energy into the water. This second-stage heat extraction pushes the unit's energy factor above 0.90 UEF, compared to 0.82 to 0.87 for a non-condensing unit. Condensing units vent at lower exhaust temperatures, allowing PVC venting rather than stainless steel, which simplifies installation in many homes. The trade-off is higher equipment cost and the need to manage condensate drainage. For most Lehigh Valley homeowners, a condensing unit provides better long-term energy savings that offset the higher initial investment.
We make every effort to schedule service and repair visits quickly. Call us at 267-377-4172 to discuss your situation and check current availability.
Yes. We serve all of those communities and many others throughout Eastern Pennsylvania in Bucks, Montgomery, and Lehigh counties.
We flush the heat exchanger with a descaling solution, inspect the inlet filter, check the venting for obstructions or deterioration, test ignition and burner operation, review error code history, and confirm the unit is heating to the set temperature.
Yes. Many tankless models are designed specifically for outdoor installation, which eliminates venting requirements and frees up interior space. Outdoor installation requires a unit rated for outdoor use and freeze protection if the climate requires it. We assess the right option for your property and Eastern Pennsylvania winters.
With proper installation and maintenance, a tankless water heater can last 20 years or more—nearly twice as long as a standard tank-style unit.
Yes. Tankless units are wall-mounted and take up much less space than a tank. Many models can be installed outdoors in covered locations, in tight utility closets, or on garage walls, depending on the climate and local code requirements.
Mastery Plumbing provides licensed (PA133897), insured, and bonded tankless water heater installation with master plumber Dan Dunn's 25+ years of hands-on water heating system experience throughout Allentown, Quakertown, and the Lehigh Valley. We size correctly for your household, manage all permits and inspections, and handle gas line and venting modifications in scope. Our 4.8-star Google reviews reflect consistent, transparent service. We offer same-day repair calls, 24/7 emergency response, and ENERGY STAR-eligible equipment. Call [phone] to schedule.
The VIP Deluxe Care Plan includes annual tankless water heater maintenance: descaling, screen cleaning, venting inspection, and performance verification, as the included annual maintenance benefit. All VIP Care Plan tiers also include waived service call fees, discounted emergency dispatch rates, and annual multi-point plumbing inspections. For tankless water heater owners, annual maintenance under the VIP Plan keeps the unit operating at rated efficiency and preserves manufacturer warranty coverage. Visit our VIP Plans page to compare all three tiers.

Other ways the Mastery Plumbing team keeps your home running.

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Routine care that pays for itself.

Annual inspections, priority scheduling, and no service fees — so small things stay small. Cancel anytime.

VIP Basic

19.95/per month

  • Never a service fee & discounted emergency fee
  • Annual tank water heater cleaning, UV light replacement, drain cleaning, sump battery, or filters
  • Annual multi-point visual plumbing inspection

VIP Deluxe

29.95/per month

  • Never a service fee & discounted emergency fee
  • Annual tankless water heater cleaning, or drinking water filtration serviced
  • Annual multi-point visual plumbing inspection

VIP Plus

39.95/per month

  • Never a service fee & discounted emergency fee
  • Lifetime warranty eligible
  • Optional $10 add-ons
  • Annual multi-point visual plumbing inspection

All plans billed monthly · No contracts · Cancel anytime

Let's get your water running clean.

Tell us what's going on. We'll respond in under an hour during business hours, and we triage emergencies first.

24/7 DIRECT LINE (267) 377-4172 Tap to call — answered live.
HEADQUARTERS 1534 West Broad Street, Ste 700
Quakertown, PA 18951
HOURS Available 24/7 — including holidays.