Tankless Water Heaters in Austin & San Antonio

Yes, with two conditions. Hard water leaves scale inside the heat exchanger, where the water passes through narrow passages that are heated hard and fast. Left alone, scale insulates the exchanger, drops efficiency, triggers error codes and eventually damages the unit. The first condition is annual descaling, which is why we install isolation valves on every unit so it can be flushed without disassembly. The second is a serious look at water treatment. A softener ahead of the tankless unit removes the problem at the source, and in San Antonio’s especially hard water we consider it close to mandatory for a long service life. A salt-free conditioner is a lighter-touch alternative that reduces scale adhesion.

Two numbers: flow rate and temperature rise. Flow rate is how many gallons per minute of hot water you need at once. A shower, a kitchen sink and a washing machine running together add up quickly. Temperature rise is the difference between the incoming cold water and the hot water you want at the tap. In Central Texas that rise is small in summer, when the ground water is warm, and much larger after a winter cold front. A unit sized for July will disappoint you in January, so we size for the cold months. If your peak demand is high, one large unit or two smaller ones in tandem both work, and we will price whichever fits the house better.

Almost always, but it is more than a swap. A gas tankless unit draws several times the gas of a tank heater at full fire, so the gas line from the meter often needs to be upsized, and sometimes the meter does too. The venting is different and specific to the unit, and a condensing model needs a drain for the acidic condensate. The unit needs a wall location that satisfies all three. Electric tankless units avoid the gas and venting but need a large amount of electrical capacity, which not every panel has. None of that is a reason not to convert; it is the reason a proper quote covers the whole job rather than the box on the wall.

Yes, and skipping it is the main reason tankless units fail early here. Once a year the heat exchanger should be descaled by circulating a descaling solution through it via the isolation valves, and the inlet water filter and any air intake screen should be cleaned. On a unit fed by softened water the scale builds much more slowly, but the annual check is still worth it for the filter, venting, condensate drain and a look at the error history. We can handle it as part of water heater maintenance, and Care Club members get no dispatch fees and 5% off any repair we find.

Yes, unless recirculation is part of the plan. A tankless unit heats water on demand, but that water still has to travel through the same pipes as before, so the far bathroom waits just as long, and sometimes a few seconds longer while the burner lights. The fix is a recirculation system, either built into the unit or added as a small pump and return line, which keeps hot water near the fixtures on a schedule or on demand. It adds cost and a little energy use, so we only recommend it where the wait is genuinely annoying, typically a large single-story home with the unit at one end and the primary bath at the other.