Tankless Water Heater Service in The Dominion, TX
Larger homes often run more than one tankless water heater, and each unit needs its own maintenance. Will’s Plumbing & Testing Service flushes, maintains, and repairs tankless water heaters for homes in The Dominion and across Northwest San Antonio.
Availability depends on technician scheduling, service location, access conditions, and current call volume. Call us to confirm availability for your address.
Serving San Antonio since 1999. Led by William Shilling, whose plumbing career began in 1988 and who has been a licensed Master Plumber since 1993.
A Recent Two-Unit Tankless Service in The Dominion
What the homeowner reported: the hot water was not heating well, and both of their Rinnai tankless water heaters were due for a flush.
What our technician found: a significant heating performance problem caused by sediment buildup.
What we did: we flushed both Rinnai tankless units.
Result: the technician checked that the water heaters were working before leaving. The service was completed in September 2026.
Two Units, Two Flushes
When a home has two tankless water heaters, each one builds up scale and sediment on its own. If one unit is not heating well, the other may not be far behind, so it usually makes sense to service both at the same visit.
Attic installations like this one also take more setup time than a garage or exterior unit, since the flush equipment has to be staged safely in the attic space.
Sediment, Hard Water, and Heating Performance
San Antonio’s hard water leaves minerals behind inside a tankless unit’s heat exchanger. As that buildup grows, it can affect how well the unit heats. A flush circulates a descaling solution through the unit to help clear it. See how often to flush a water heater and why hard water shortens equipment life.
Not every heating problem is buildup. Failed parts, gas supply, and venting problems need diagnosis and repair instead. See tankless water heater service for repair, replacement, and installation.
More Plumbing in The Dominion
See our Dominion plumbing page for the other services we provide in the area, and our Rinnai tankless water heater service page.
Tankless Water Heater Service in The Dominion: FAQs
Do you service tankless water heaters in The Dominion?
Yes. The Dominion is within our regular service area. We flush, maintain, and repair tankless water heaters there. Call to confirm availability for your address.
My home has two tankless units. Should both be flushed?
Usually, yes. Each unit builds up scale on its own, and servicing both at one visit keeps them on the same maintenance schedule.
What does sediment buildup do to a tankless water heater?
Buildup inside the heat exchanger can reduce heating performance and lead to temperature problems or error codes. A flush helps clear it. Other problems need diagnosis.
Can you service a tankless unit in the attic?
Yes. Attic installations take more setup, and access conditions affect how long the service takes.
Are you licensed?
Yes. Work is performed by or under the supervision of a Responsible Master Plumber licensed by the Texas State Board of Plumbing Examiners (TSBPE).
Need Tankless Service in The Dominion?
If your tankless water heaters are due for a flush or not heating the way they should, call Will’s Plumbing & Testing Service.