A tankless water heater heats water as it flows instead of storing it, so it will not run out and takes up very little space. Getting that result depends on sizing, gas supply, venting and water quality. A tankless unit installed on undersized gas pipe or hard water will disappoint.
The causeWhy it happens
Homeowners switch to tankless to free up floor space, stop running out of hot water during back-to-back showers, and avoid the slow leak that ends every tank's life. But a gas tankless unit draws far more gas at full fire than a tank heater does, so the existing gas line is often too small. It also needs dedicated venting and, in San Antonio, protection from scale.
DiagnosisWhat we check first
- 01Gas pipe sizing and meter capacity
- We calculate total load on the line. Many homes need a larger gas line run from the meter.
- 02Venting route
- Tankless units need specific vent materials and clearances. We plan a route through a wall or roof.
- 03Flow rate needed
- We size the unit to the number of fixtures you run at the same time.
- 04Water quality
- Hard water scales heat exchangers quickly. We recommend a softener or scale filter and install isolation valves for flushing.
The optionsWhich repair fits, and when
We lay out the choices plainly, explain what each involves and leave the decision with you.
Tank to tankless conversion
The most common job. New gas line, venting, mounting, isolation valves and condensate drain if needed.
Tankless replacement
An existing tankless unit failed. Venting and gas are usually in place, so the swap is simpler.
Tankless with water treatment
A softener or scale prevention system is added so the heat exchanger stays clean.
Local conditionsTankless Water Heater Installation on the west side of San Antonio
Edwards Aquifer water is hard, and tankless heat exchangers are narrow passages that scale quickly without protection. We install service valves on every tankless unit so it can be descaled periodically, and we often pair the install with a softener. Conversions involve gas and venting changes that typically require a permit through the City of San Antonio.
From the jobTankless water heater installed with a water softener system
A few things that help
Think about where you want the unit mounted, often on an exterior wall or in the garage. Know which fixtures tend to run at the same time in your home so we can size it properly.
QuestionsCommon questions about tankless water heater installation
Will a tankless heater work with my current gas line?
Often the line needs upsizing. We calculate the full load before recommending a unit.
Does a tankless unit need maintenance?
Yes. In hard water areas the heat exchanger should be descaled periodically. Isolation valves make that straightforward.
Is there a delay before hot water arrives?
Water still has to travel from the heater to the fixture, so the wait is similar to a tank. A recirculation option can shorten it.
Related workServices that often go with it
Talk it through with usOpen 7 AM to 11 PM every day. Se habla español.
(210) 761-4788