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Hot Water On Demand

Tankless Water Heaters

Get help with tankless water heater installation, replacement, repair, maintenance, and descaling from Harts. Our licensed plumbers help homeowners compare system options, plan tank-to-tankless conversions, review flow-rate needs, and understand gas, electrical, venting, and plumbing requirements.

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Tankless Water Heater Services

Tankless systems can provide efficient, space-saving hot water when they are properly sized, installed, and maintained. Harts helps with new installations, system replacements, repairs, descaling, and tank-to-tankless conversions.

Tankless Installation

Install a new tankless system with proper sizing, placement, venting, and utility planning.

Tankless Replacement

Replace an aging or unreliable tankless unit with a compatible system built for your home.

Repair & Diagnostic

Error codes, ignition problems, flow issues, temperature changes, and shutdowns.

Descaling & Maintenance

Remove mineral buildup and maintain system performance with preventive services.

On-Demand Hot Water That Fits Your Home

Tankless water heaters heat water on demand instead of storing hot water in a tank. The right system depends on your household’s flow-rate needs, fixture use, installation location, available energy source, and long-term efficiency goals.

Harts helps homeowners compare practical tankless options before work begins. Our plumbers review your home’s setup, explain system requirements, and help you choose a tankless water heater that can support dependable hot water during everyday use.

Harts technician discussing water heater service options with a homeowner
Harts technician evaluating tank and tankless water heater equipment

Converting From Tank to Tankless Systems

Switching from a traditional tank water heater to a tankless system can free up space, reduce standby energy loss, and provide hot water on demand. However, a conversion may require more planning than a standard replacement.

Gas supply, electrical capacity, venting, condensate drainage, water lines, installation location, and service access should all be reviewed before choosing a system. Harts evaluates these requirements and explains what needs to happen before moving forward.

Reasons to Consider a Tankless System

A tankless water heater can be a good fit when your home needs a more efficient, space-saving, or flexible hot water setup. The best option depends on household demand, available utilities, installation requirements, and how your family uses hot water.

You want hot water on demand

You are planning a remodel or new setup

Your home needs a space-saving system

You want to convert from a storage tank

Your current system struggles during peak use

You want better long-term efficiency

Harts technician greeting a homeowner before a service appointment

Why Choose Harts?

Tankless systems require careful planning, proper sizing, and attention to your home’s plumbing, gas, electrical, venting, and drainage requirements. Harts helps homeowners understand their options before choosing a system or approving service.

Our licensed plumbers install, replace, repair, and maintain tankless water heaters. Whether you are converting from a tank, troubleshooting an error code, scheduling descaling, or comparing new equipment, we provide clear recommendations and upfront pricing before work begins.

*5% off eligible services, up to $200. Proof of eligibility required. Terms and exclusions may apply.

Ready to Go Tankless?

Compare your options, review installation requirements, and get upfront pricing from a licensed Harts plumber.

What to Expect

Whether you are planning a new tankless system or servicing an existing one, Harts helps you understand your options and next steps.

01

Schedule Service

Call or book online and tell us about your current system, hot water needs, or tankless concerns.

02

In-Home Inspection

A Harts plumber evaluates the equipment, installation area, utilities, venting, and household demand.

03

Compare Options

We explain compatible tankless options, service recommendations, requirements, and upfront pricing.

04

Complete Service

We complete the approved installation, repair, replacement, maintenance, or descaling work.

05

Test and Review

We test the tankless system, clean the work area, and review maintenance tips, settings, and next steps

Plan Your System

Tankless Water Heater Planning and Service

Tankless water heater service depends on the home’s hot water demand, system type, fuel source, installation location, and maintenance needs. A properly planned system should account for flow rate, temperature rise, venting, electrical capacity, gas supply, drainage, water quality, and access for future service.

Choosing a Tankless System

Tankless systems need to be matched to the home, not just selected by brand or size alone.

Sizing and Flow Rates

Tankless systems are sized by flow rate and temperature rise. Household size, fixture use, simultaneous demand, and incoming water temperature all affect which system can provide dependable hot water during everyday use.

Tank-to-Tankless Conversions

A tank-to-tankless conversion may require changes to the installation location, plumbing connections, gas supply, venting, electrical service, or condensate drainage. Reviewing these details early helps avoid surprises during installation.

Gas and Electrical Requirements

Gas and electric tankless systems have different setup needs. Gas models may require proper gas-line capacity and venting, while electric models may require dedicated circuits, panel capacity, and electrical upgrades depending on the system.

Maintaining Tankless Systems

Routine care and timely repairs help protect performance, efficiency, and system reliability.

Tankless Water Heater Repair

Tankless repair may involve error codes, ignition failures, temperature swings, low flow, sensor issues, mineral buildup, or unexpected shutdowns. A professional diagnosis helps identify whether the issue can be corrected with cleaning, adjustment, or part replacement.

Tankless Water Heater Descaling

Descaling helps remove mineral buildup from internal components, including the heat exchanger. Regular descaling can support water flow, heating performance, and efficiency, especially in homes with hard water or higher hot water usage.

Replacement and System Upgrades

An older tankless unit may need replacement if repairs become frequent, parts are limited, or performance no longer meets household demand. Harts can help compare compatible upgrades and explain whether repair or replacement makes more sense.

Reviews

See what local homeowners have shared about their experience with Harts plumbers and our tankless water heater service.

“I reached out to Harts after receiving a very high bid from another local company to install a new tankless water heater and decommission an old solar hookup. Jeremy explained the work and issues with our current setup. Justin and another technician completed the installation, kept the area clean, communicated clearly, and explained how everything worked when they were finished.”

Shalimar G.

Tukwila, WA

Tankless Water Heater Installation

“Many thanks to Dominick, Spencer, and Anthony for removing our old, leaking tank and replacing it with a tankless water heater. I couldn’t have asked for a better team. They provided excellent customer service, professionalism, skill, and care throughout the job.”

Wayne M.

Tacoma, WA

Tank-to-Tankless Replacement

“Harts had great communication, and both technicians we worked with were very helpful. Not many companies can give you a price one day and complete the installation the next. They installed a new tankless water heater and a septic-friendly disposal. I would highly recommend them.”

Joe R.

Hansville, WA

Water Heater Flush

“Jeremy was very helpful in explaining what my tankless water heater needed and the ongoing support Harts could provide. He took time to explain my options, and I’m very happy with the company and its knowledgeable team.”

Tiffanie R.

Olympia, WA

Tankless Water Heater Maintenance

“I had my tankless water heater serviced and couldn’t be happier with the experience. The technician was thorough, professional, and arrived on time. He clearly explained the process and walked me through ongoing maintenance recommendations so I know how to keep the system running efficiently.”

Shipra U.

Pierce County, WA

Tankless Water Heater Service

“Chris was kind, knowledgeable, and fast. He fixed my tankless heater the same day.”

Nico S.

Pierce County, WA

Tankless Water Heater Repair

“Harts installed a new toilet, tankless water heater, and replaced the shutoff valve to the main water line. The technician was professional, took great care of my home, and answered all my questions with patience. I would highly recommend Harts.”

Patty Q.

Everett, WA

Tankless Water Heater Installation

“Jordan gave thorough answers to all our questions and provided helpful information. As a result, we ordered installation of a tankless water heater system. This is a very good company, and we definitely recommend them.”

Sheila M.

Steilacoom, WA

Tankless Water Heater Consultation

“We requested an urgent visit for our building hot water heater and were able to have a technician out the same day. Dominick addressed the issue, verified a solution, and provided a repair quote quickly. Harts scheduled the repair as soon as the part arrived, and the unit was repaired quickly.”

Ashleigh P.

Pierce County, WA

Hot Water System Repair

Harts service area map covering communities across Pierce, King, Thurston, Snohomish, and Kitsap counties.

Our Service Areas

Harts provides tankless water heater service throughout the Puget Sound region, serving homeowners across Pierce, King, Thurston, Snohomish, and Kitsap counties. Our licensed plumbers help with tankless installation, replacement, repair, maintenance, descaling, and tank-to-tankless conversions.

Primary service hubs:

The Harts markers show our primary service hubs, while the shaded map represents the broader communities we serve. From Olympia and Tacoma to Renton, Seattle, Lynnwood, and the Kitsap Peninsula, help choosing and installing a new water heater is nearby.

Save On Tankless Water Heaters

Offers & Discounts

Check out the current promos and coupons from Harts Plumbers, Electricians, & HVAC Technicians.

Tankless Water Heater FAQs

Find answers to common questions about tankless installation, replacement, repair, descaling, sizing, conversions, and system requirements.

Tankless water heaters may be worth it for homeowners who want hot water on demand, better space efficiency, and reduced standby energy loss. The best choice depends on household demand, installation requirements, fuel source, budget, and whether the system can be properly sized for daily use.

Yes, many homes can switch from a traditional tank to a tankless water heater. The conversion may require updates to gas supply, electrical capacity, venting, plumbing, condensate drainage, or installation location. Harts can review your home and explain which tankless options are practical.

A tankless water heater is sized by flow rate and temperature rise. Flow rate measures how much hot water the system can supply at once, while temperature rise measures how much the water must be heated. Fixture use, household size, and incoming water temperature all matter.

Yes, tankless water heaters need routine maintenance to help protect performance and efficiency. Service may include descaling, cleaning filters, checking connections, reviewing error codes, and inspecting system operation. Maintenance needs depend on water quality, usage, manufacturer guidance, and the specific equipment installed.

Tankless water heater descaling removes mineral buildup from internal components, especially the heat exchanger. Scale can restrict water flow, reduce heating performance, lower efficiency, and contribute to error codes. Homes with hard water or heavy hot water use may need descaling more often.

Yes. Harts repairs (on-demand) tankless water heaters with error codes, ignition problems, temperature fluctuations, restricted flow, mineral buildup, sensor issues, and shutdowns. Our plumbers diagnose the system, explain the findings, review available options, and provide upfront pricing before approved work begins.

Some tankless systems may require gas or electrical upgrades. Gas models may need proper gas-line capacity and venting, while electric models may need dedicated circuits or panel capacity. Installation requirements depend on the selected system, home setup, and household hot water demand.

Tankless water heaters may last longer than traditional tank systems when properly installed and maintained. Actual lifespan depends on water quality, usage, maintenance, equipment design, and installation conditions. Regular descaling and timely repairs can help protect performance and extend useful system life.

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Ongoing Maintenance

Join The Harts Home Care Plan

Harts Home Care Plan Member

Stay ahead of unexpected home service problems with the Harts Home Care Plan. Members receive priority service, no trip fees, dedicated support, and 10% off eligible service work, making it easier to care for the systems that keep your home safe and comfortable.

Membership includes ongoing preventive service, with biannual HVAC tune-ups, an annual plumbing and sewer safety check, and an annual electrical safety inspection. These visits can help identify wear, safety concerns, and developing problems before they lead to larger repairs or unexpected disruptions.

The plan supports your home’s plumbing, sewer and drain, electrical, heating, and cooling systems, giving you one convenient way to maintain essential equipment, receive member benefits, and get help when you need it.

Plumbing Services Across the Puget Sound

Our licensed plumbers provide plumbing services throughout the Puget Sound region.
For tank or tankless water heater help, find a plumber near you.

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