Tankless Water Heaters in San Antonio, TX

Not strictly, but we will strongly recommend some form of scale protection, and the manufacturers agree. Edwards Aquifer water deposits minerals on the tankless heat exchanger every time it fires, and those passages are narrow. A whole-home softener is the most complete answer, because it protects every fixture and appliance in the house, not just the heater. A scale-inhibitor cartridge on the cold inlet is a smaller step that helps. Either way, the unit needs an annual descaling flush through isolation valves. A tankless heater installed here with no protection and no flushing is the one that shows up on our repair schedule a few years in.

Yes, and many are installed on an exterior wall here because it avoids venting through the roof and frees up the closet. The catch is winter. Outdoor tankless units protect themselves from freezing with small electric heaters inside the cabinet, and those only work while the unit has power. During the February 2021 storm, extended outages left outdoor units with no protection, and frozen heat exchangers followed. If you go outdoor, plan for it: know how to drain the unit, keep the freeze-protection circuit powered if you have backup power, and consider an indoor location if the wall in question faces north and takes the wind.

A short burst of cold in the middle is called a cold-water sandwich, and a little of it is normal. When someone shuts a tap off and reopens it a minute later, the hot water already in the pipe arrives first, then a slug of cold that entered while the burner was off, then fresh hot water. Constant swings are a different matter. In San Antonio the usual causes are a heat exchanger scaled to the point that the unit cannot hold temperature, a dirty inlet filter or flow sensor, or a unit that is undersized for the flow it is being asked to heat. A descaling flush and a flow test tell us which.

Often not without changes. A gas tank heater draws a modest amount of fuel over a long recovery cycle. A whole-house gas tankless unit burns several times that rate while it is running, because it has to heat water instantly. The half-inch line that fed the old tank may not deliver enough gas, especially when the furnace, range or a pool heater is running at the same time. The symptom is an ignition fault or a unit that cannot reach temperature under load. Before we quote, we look at the meter, the line size and the total load on it. If the line needs upsizing, that is part of the written price, not a surprise on install day.

It can be, but the case is different than it is for a large house. In a two-bath home the main benefits are space, longevity and not running out of hot water when guests visit. The energy savings are real but modest, because a smaller household was not keeping a huge tank hot. The upfront cost is higher than a tank replacement, and if the gas line needs upsizing, higher still. If your current tank is healthy, we will usually say keep it and add a softener. If the tank is at the end of its life anyway, tankless is worth pricing side by side with a new tank. Both quotes come in writing, and financing through Service Finance Company is available, subject to credit approval.