If you live in Arlington and you have been thinking about swapping an old tank for a tankless unit, you are not alone. Tankless heaters take up a lot less wall space, they don't sit there reheating a 50-gallon tank all night, and they can give you hot water on demand. A lot of folks in older neighborhoods off Cooper Street and out toward Lake Arlington have made the switch over the last few years.
Before you start pulling anything off the wall, though, it helps to know where the line is. Some parts of a tankless install are reasonable for a handy homeowner. Other parts involve gas, combustion, and water pressure that can go badly wrong if the work is off by a little. This post walks through what we think a homeowner can safely take on, what should always go to a plumber, and the signs that a unit needs a call before it becomes a bigger problem.
Tasks a homeowner can reasonably handle
Start with the things that don't touch gas or the main water connection. Routine maintenance is the big one. Tankless units in North Texas deal with hard water, and mineral scale builds up inside the heat exchanger over time. Most manufacturers describe a descaling process using a pump and a food-safe descaling solution, and a careful homeowner can run that cycle once or twice a year following the manual step by step.
Cleaning the inlet water filter is another good one. Most units have a small mesh screen near the cold water inlet. Shut off the water supply, close the isolation valves, place a towel and a bucket underneath, unscrew the filter housing, rinse the screen under running water, and put it back. Take your time with the O-ring so it seats properly.
You can also keep the air intake or vent cover clear of leaves, dust, and cobwebs. Arlington gets its share of cottonwood fluff and dust storms in spring, and a blocked intake can trigger error codes. Check the outside vent cover once a month during those months and wipe it down if it looks clogged.
- Read the error code on the display and look it up in the manual before doing anything else
- Reset the unit only if the manual says a simple power cycle is safe
- Log dates for descaling and filter cleaning so you have a record
Work that should go to a plumber every time
Gas connections are the first thing to leave alone. A tankless unit burns natural gas at high BTU output, and a loose fitting or an undersized gas line can create a leak or a dangerous condition you cannot smell or see. If you ever notice a rotten egg smell near the unit, leave the house, do not flip any switches, and call your gas utility from outside.
Venting is the second. Tankless heaters need a properly sized and sealed venting system, either direct vent or power vent, and the clearances on that system are specific. Venting that is off by a few inches or runs through the wrong wall can push exhaust back into the home. Anyone who has seen a flue pipe pulled apart knows how quickly a small mistake turns serious.
Main water line work is the third category. Sweating new copper, changing the size of the supply line, or adding a recirculation loop changes the flow and pressure the unit sees. A tankless heater needs a minimum flow rate to fire, and oversized or undersized lines can cause short cycling or failure. Our crew sees this often in older Arlington homes where the galvanized lines have already narrowed from decades of buildup.
Electrical work belongs to a licensed electrician, and most tankless units need a dedicated circuit with the right breaker size. If the unit is electric rather than gas, the amperage requirements are high, and running a new circuit is not a weekend project.
Permits and inspections
Many jurisdictions in the Arlington area require a permit when a gas appliance is replaced or relocated. Permits exist so that someone other than the homeowner checks the work. If you are planning a full install, call the City of Arlington permit office before you buy the unit so you know what is required for your address.
Signs it is time to call a plumber
Some problems are easy to spot once you know what to look for. If the unit keeps cycling on and off in the middle of a shower, the water flow may be too low for the heater to stay lit, or the scale buildup may be heavy enough that the unit is starving for flow. A descaling cycle might help, but if the problem comes back within a few weeks, a plumber should check the whole system.
Water that comes out lukewarm even when the setting is high points to a few possibilities. It could be a gas supply issue, a sensor problem, or a flow restriction. Any of those needs someone who can read the diagnostics and test the gas pressure properly.
Leaks around the unit, rust on the bottom panel, or water pooling near the base are also reasons to stop and call. Water and a gas-fired heater are a bad mix when seals fail. Shut off the water supply to the unit if you can reach the isolation valves, and call for help rather than trying to tighten fittings under pressure.
Strange noises like banging or a loud rumble usually mean water hammer or a failing component. Hammering can damage the unit and the lines behind it, so have it looked at rather than waiting to see if it settles down.
Getting ready for your call
When you call us, have the make and model of the unit, the age if you know it, and the error code if one is showing. Tell us what you already tried, like descaling or cleaning the filter, and whether the problem started suddenly or built up over time. That information helps us decide what to bring on the first visit.
If you are still deciding between a tankless install and a traditional tank, we are happy to talk through the trade-offs on the phone. Give Arlington Commercial Plumbing a call and we will walk you through what makes sense for your home, your water, and your budget. We know this area, and we know the older lines and hard water that show up across town.
