Rinnai Tankless Water Heater Installation

Authorized Rinnai installer in Northern Virginia. We size the unit, check gas, vent and drain, and price every line before work starts.

Call 703-342-8068Get My Rinnai Estimate

★ 4.9 on Google · 59 reviews · Authorized Rinnai installer · Arlington, VA

Your itemized tankless estimateFree, with every line priced before work starts
  1. The tankless unitModel, gas input and flow rate, sized to the taps you run at once
  2. Gas line and meter checkAn upgrade is its own line if the current pipe cannot carry the unit
  3. Vent kit and wall penetrationIndoor units vent to the outside
  4. Condensate drain and neutralizerCondensing models
  5. Isolation valvesSo the unit can be flushed
  6. Electrical outletThe unit needs power for its controls and fan
  7. Remove and haul away the old tankDrained and taken with us
  8. Permit and inspectionWhere the job requires one

We check the gas line, vent route and drain on the site visit, before we price the job.

An authorized Rinnai installer in Arlington

We are an authorized Rinnai installer, based in Arlington and installing across Northern Virginia. The Rinnai model is chosen for your house and named on your estimate.

Two things decide the model: how much hot water you run at once, and what the house can supply. A condensing unit is more efficient but needs a drain for its condensate; a non-condensing unit needs a vent rated for hotter exhaust. We check the gas line, the vent route and the drain on the site visit before we name a model.

Which Rinnai?

Rinnai's current residential range splits into condensing units (higher efficiency, need a condensate drain) and non-condensing units (simpler venting needs, lower efficiency), each with and without a built-in recirculation pump.

Recirculation keeps hot water close to the far taps, so a bathroom at the end of a long run gets hot water sooner. Whether it is worth it depends on the length of your pipe runs, which we look at on the visit.

Series and efficiency figures as Rinnai lists them (rinnai.us, October 2026). UEF is the federal efficiency rating; higher is better.
TypeHighest listed UEFRecirculation
SENSEI RXCondensing0.98Smart-Circ intelligent recirculation
SENSEI RXPCondensing0.98Built-in pump
RUSCondensing0.90Wi-Fi module sold separately
RUCSCondensing0.85Wi-Fi module sold separately
RENon-condensing0.81Wi-Fi module sold separately
REPNon-condensing0.82Built-in pump

What a Rinnai install includes

The Rinnai unit plus the gas line check, the vent kit, the condensate drain on condensing models, isolation valves for flushing and an outlet. Each is a line on the estimate.

Parts of a gas tankless water heater installationA wall-mounted gas tankless water heater. Numbered parts: 1 the tankless unit, 2 the gas line sized for the unit with its shutoff and sediment trap, 3 the vent through the outside wall, 4 the condensate drain and neutralizer, 5 the isolation valves used to flush the unit, 6 the electrical outlet.
A gas tankless install. 1 the unit, 2 gas line with shutoff and sediment trap, 3 vent to the outside, 4 condensate drain and neutralizer, 5 isolation valves for flushing, 6 outlet.

Flushing and upkeep

A tankless unit is flushed through its isolation valves to clear scale from the heat exchanger. How often depends on your water hardness and use.

Northern Virginia water ranges from moderately hard to hard depending on the supplier, and scale builds faster in a heat exchanger than in a tank. Your area page lists your supplier's published hardness.

How a replacement works

  1. Call or send the form with what you have now: fuel, tank size and age.
  2. We look at the space, the gas or electrical hookup, the vent and the water lines.
  3. You get one free, itemized estimate, with the model named and every line priced.
  4. Install day: the old heater is drained, disconnected and hauled away, the new one is set, connected and tested.
  5. We show you the shutoff, the relief valve and how to drain or flush the new unit.

Where we install

Northern Virginia, from our base in Arlington. Each area page lists the local permit office, water supplier and what they mean for your water heater.

ArlingtonOur home county. Hard water, older houses, a chimney vent check on gas units.AlexandriaCity or county address, hard water, Old Town and Parker-Gray vent rules.FairfaxFairfax County and the City of Fairfax: Reston, McLean, Vienna, Springfield, Chantilly.Falls ChurchCity fuel-gas permit, Washington Aqueduct water, mostly pre-1980 homes.Loudoun CountyAshburn, Sterling, Leesburg. Newer homes, two gas utilities, propane in the west.

Questions homeowners ask

Yes. We are an authorized Rinnai installer based in Arlington, VA, and we install Rinnai tankless water heaters across Northern Virginia.

Get an itemized water heater estimate

Tell us what you have now and what you want next. The estimate is free and itemized.

Service Area

Arlington, Alexandria, Fairfax, Falls Church and Loudoun

Class A VA Contractor Rated 4.9 on Google Free, Itemized Estimates

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