A tankless water heater heats water on demand as it flows through the unit, rather than storing a tank of pre-heated water. In Kent, WA, tankless units deliver continuous hot water to multiple fixtures simultaneously, use 20 to 30 percent less energy than tank heaters, and last 20 years or more. Kent Plumbing Services installs and services Rinnai, Navien, Rheem, Noritz, and other major brands. Call (253) 378-0055.
Tired of cold showers when two people are home at the same time? Call (253) 378-0055 — we will size the right tankless unit for your Kent home, walk you through the options and costs, and schedule installation.
(253) 378-0055Running Out of Hot Water Is a Tank Water Heater Problem
A conventional tank water heater stores 40 to 50 gallons of pre-heated water. When that supply is exhausted — by consecutive showers, a laundry cycle running alongside dishwasher use, or simply a household that has grown — the tank takes 30 to 45 minutes to reheat before hot water is available again. This is a structural limitation of tank-based systems, not a malfunction.
As tank water heaters age, their effective capacity shrinks further due to sediment accumulation at the tank bottom. A 10-year-old 50-gallon heater may deliver effectively 35 to 40 gallons of hot water before temperature drops.
Additionally, tank heaters experience standby heat loss — the energy consumed to keep stored water hot around the clock, even when no one is drawing hot water. The U.S. Department of Energy estimates standby loss at 10 to 20 percent of a tank heater's total energy consumption.
On-Demand Hot Water — The Tankless Advantage
A tankless unit fires when a hot water tap is opened and shuts off when it closes. There is no stored water to deplete and no standby heat loss. The result is continuous hot water at the set temperature for as long as you need it, and energy consumed only when hot water is actually being used.
Properly sized tankless units serve multiple simultaneous draws — two showers running at the same time, a shower and a dishwasher, a shower while a washing machine is cycling. Sizing is based on the number of simultaneous draws and the incoming cold water temperature, which in Kent's climate averages around 48°F in winter — a key input to correct sizing.
We install condensing tankless units — the highest-efficiency category, with thermal efficiencies above 90 percent — from Rinnai, Navien, Rheem, and Noritz. We also service and descale existing tankless units, which require annual descaling in King County's moderate mineral content water.
Kent Plumber Tankless Water Heater Services
Complete tankless water heater repair, installation, and maintenance coverage — handled by licensed Kent plumbers with same-day availability.
Tankless Water Heater Installation
Gas and electric tankless units installed with proper venting, gas, and electrical connections.
Tankless Water Heater Repair
Error codes, ignition failure, and flow sensor issues diagnosed and repaired.
Tankless Unit Descaling
Mineral scale flushed from heat exchanger to restore efficiency and flow rate.
Gas Tankless Service
Gas supply line, regulator, and burner service for natural gas tankless units.
Electric Tankless Service
Element, thermostat, and electrical connection service for electric tankless heaters.
Conversion from Tank to Tankless
Existing tank water heater removed and tankless system installed in its place.
Tankless Annual Maintenance
Yearly flush, filter cleaning, and system check to maintain warranty and performance.
Tankless Replacement
Failed tankless unit replaced with same or upgraded model — same-day service.
Hybrid Water Heater Service
Heat pump hybrid water heater installation, repair, and efficiency optimization.
Tankless Installation Requires the Right Sizing and Venting
24/7 Live Dispatch
We answer every hour. When you call at 2 AM, a real person picks up and sends a plumber — not a voicemail.
Fast Local Response
Based in Kent, WA — we reach most service-area homes within 45 to 60 minutes of your call.
Licensed
Washington State-licensed plumbers, protecting your home and your investment.
Clear Pricing First
We diagnose, explain, and price the work before touching anything. No surprises at the end of the invoice.
Right Equipment for the Job
We use Manual J-style hot water demand calculations to size tankless units correctly — undersized units can't keep up with demand, and oversized units cycle inefficiently.
Locally Operated
Not a franchise, not a dispatch center — a locally owned and operated plumbing company that knows Kent's neighborhoods and housing stock.
Signs You Are Ready for a Tankless Water Heater
- Running out of hot water when two or more people shower close together
- Tank water heater is 10+ years old and approaching replacement anyway
- High utility bills where the water heater is a significant contributor
- Limited utility room space — tankless units mount on a wall and free up floor space
- Planning a home addition or ADU that will increase hot water demand
- Current tank provides inconsistent temperature throughout the day
What to Know Before a Tankless Installation
- Gas tankless units require a larger gas supply line than most tank heaters — our plumber will assess your current gas line size during the estimate visit
- Condensing tankless units require a PVC condensate drain — we will identify the best drain location during planning
- Venting for tankless units is typically direct-vent (two-pipe) PVC — we will determine the vent routing during the site assessment
- Most tankless installations in Kent require a mechanical permit — we handle this process
Tankless Water Heaters in Kent, WA — Descaling Matters Here
Kent's municipal water supply carries moderate mineral hardness — primarily calcium and magnesium carbonates. These minerals deposit on the heat exchanger surfaces inside a tankless unit over time, reducing heat transfer efficiency and, if left unaddressed for several years, can cause heat exchanger failure.
Annual descaling with a food-grade citric acid flush is the standard maintenance procedure for tankless water heaters in King County. We offer descaling service for all brands and can schedule it during a routine visit to extend your unit's service life and maintain its efficiency ratings. Kent homeowners who have hard water or who have never had their unit descaled despite several years of operation should prioritize this service.
Service Coverage
We provide tankless water heater installation and service services throughout Kent and the surrounding South King County area.
Frequently Asked Questions
Installed cost varies by unit size, brand, fuel type, and whether gas line or venting modifications are needed. Call us for a site-specific estimate — costs can range significantly based on the installation requirements.
Yes, when correctly sized. A whole-house tankless unit is sized to handle your home's peak simultaneous hot water demand, which we calculate based on fixture count, simultaneous use patterns, and incoming water temperature.
Quality tankless units have an expected service life of 20 years or more when maintained with annual descaling. This is roughly double the lifespan of a conventional tank heater.
Gas tankless units require electricity to operate the ignition, controls, and venting fan. They do not function during a power outage unless paired with a generator or battery backup.
Annual descaling is the primary maintenance task in Kent's water conditions. Filter screens at the unit's water inlet should be checked and cleaned every six to twelve months. We recommend an annual service visit.
Endless Hot Water. Lower Bills. 20-Year Lifespan.
Tankless is not a luxury upgrade — for most Kent homes replacing a tank heater past ten years of age, it is the right economic decision. Call us to size and quote the installation.
Call Now — (253) 378-0055