# FAQ — Plumbing — Renovate Guide **Author:** Frank Mercer, Licensed GC (Ret.) | HAAG Certified Roof Inspector **Q: How much does it cost to replace a water heater in 2024?** **A:** Budget $1,000–$1,800 for a standard 40- or 50-gallon gas tank water heater installed. Electric units run $800–$1,500 installed. That price includes the unit, labor, and code-required materials like a new expansion tank and pressure relief valve discharge pipe. If your installer quotes you under $700 all-in, ask exactly what they're skipping—because something is getting skipped. --- **Q: How long does a water heater last?** **A:** A tank water heater lasts 8–12 years. Tankless units last 20+ years with proper maintenance. The date of manufacture is stamped in the serial number on the label—most brands encode the year and month in the first four characters. If your unit is past 10 years and you're already calling a plumber for repairs, replace it. You're throwing money at a unit that's living on borrowed time. --- **Q: What are the signs that a water heater needs to be replaced?** **A:** Replace it when you see any of these: rust-colored water at the hot tap, water pooling under the tank, a rumbling or popping sound during heating cycles, or hot water that runs out faster than it used to. A rumbling sound means sediment has built up on the burner surface—at that stage, flushing rarely helps. Water under the tank means the tank itself is leaking, and that unit is done. --- **Q: Tankless vs tank water heater—which one should I buy?** **A:** For most homeowners with a family of 3–4, a 50-gallon gas tank water heater from Rheem or A.O. Smith is the right call. It's $400–$700 less to install, maintenance is simpler, and replacement parts are everywhere. Go tankless—specifically a Rinnai RU199iN or Navien NPE-240A2—if you have high simultaneous hot water demand, limited space, or you're planning to stay in the home 10+ years and want the energy savings to pay back the premium. Tankless saves roughly 20–30% on water heating costs annually for a typical household. --- **Q: How much does tankless water heater installation cost?** **A:** Expect $2,500–$4,500 installed for a whole-house gas tankless unit. That range includes the unit, labor, and the extra work most installs require: upsizing the gas line to ¾-inch or larger, installing a dedicated 120V outlet for the control board, and running a new direct-vent exhaust. If you're switching from a tank to tankless, add $500–$1,000 for the gas line upgrade alone. Electricians and plumbers both touch this job, which drives the cost up. --- **Q: Why is my water heater not producing hot water?** **A:** On a gas unit, check the pilot light first—if it's out, relight it following the label instructions. If the pilot won't stay lit, the thermocouple is bad; that's a $20 part and a 30-minute fix. On an electric unit, a tripped breaker or a burned-out heating element is the culprit 90% of the time. Reset the breaker first. If it trips again immediately, you have a failed element. Elements run $15–$30 and are DIY-replaceable on most units. --- **Q: How do I unclog a slow draining bathroom sink?** **A:** Pull the pop-up stopper out—it either lifts straight out or has a small nut underneath the drain. Clean the hair and soap scum off it. Then use a zip-it drain tool to clear the pipe just below. That handles 80% of slow sink drains in 10 minutes with no chemicals. If it's still slow, you've got a partial clog further down the P-trap or drain arm. Remove the P-trap with channel-lock pliers, clean it out, and reinstall. Skip the Drano—it eats old metal pipes and only pushes the clog further down. --- **Q: How much does drain cleaning cost?** **A:** A plumber charges $150–$300 to snake a standard drain—sink, tub, or toilet line. Main sewer line cleaning runs $300–$500 for a standard snake job. If the plumber needs to hydro-jet the line, budget $500–$900. Camera inspection of the sewer line adds $150–$300 on top of that. If you're getting quoted more than $500 to clear a single fixture drain, get a second opinion. --- **Q: How do I know if my main sewer line is clogged?** **A:** You've got a main line problem when multiple fixtures back up at the same time. Flush the toilet and water comes up in the tub—that's a main line clog until proven otherwise. Other signs: gurgling sounds from floor drains when you run the washing machine, sewage smell from multiple drains, or a basement floor drain that backs up during normal water use. Don't run water until you get a plumber out. A backed-up main line can overflow sewage into your basement fast. --- **Q: What is the best water heater brand?** **A:** For tank water heaters, A.O. Smith and Rheem are the two brands I recommend without hesitation—both have wide parts availability and solid warranty programs. Bradford White is a contractor-only brand with a strong reputation but harder to find parts for in some markets. For tankless, Rinnai and Navien are the leaders. Rinnai has been in the game longer and has excellent service networks. Avoid off-brand units sold at big-box stores under house labels—warranty support is almost nonexistent when something goes wrong. --- **Q: How do I fix a leaking pipe under my sink?** **A:** First, identify whether it's leaking at a fitting or through the pipe wall itself. Tighten slip-joint nuts by hand first—overtightening with pliers cracks plastic fittings. If a compression fitting is leaking, shut off the water, cut out the bad fitting, and replace it with a new one. If the pipe itself is leaking, replace the section. For a temporary emergency fix on a metal pipe, a SharkBite push-fit repair coupling buys you time without soldering—but it's not a permanent solution for inside-wall pipes. --- **Q: Should I repair or replace my water heater?** **A:** If the unit is under 7 years old and the repair is under $300, fix it. If it's over 8 years old, the math almost never favors repair. A thermocouple replacement on a 10-year-old heater is $150 in labor—that same unit may need an anode rod, a new heating element, and then fail anyway in 18 months. Put that repair money toward a new unit. The one exception: if it's a high-end Rheem Prestige or A.O. Smith ProLine commercial unit under 12 years old, a $400 repair is still worth evaluating. --- **Q: How much does a sump pump cost to replace?** **A:** A standard submersible sump pump replacement runs $400–$800 installed. That includes a ¾ HP unit—a Zoeller M98 or Wayne CDU980E are my go-to recommendations—plus labor to swap it out. If you're also adding a battery backup system, add $300–$600. Don't cheap out on the backup. If your primary pump fails during a power outage in a heavy storm, a $400 backup system is the difference between a dry basement and $20,000 in flood damage. --- **Q: How do I know if my sump pump is working?** **A:** Pour 5 gallons of water directly into the sump pit. The float should rise and trigger the pump within seconds. The pump should clear the water and shut off cleanly. If it doesn't turn on, check the power cord and outlet first. If the pump runs but doesn't move water, the impeller is likely clogged or the check valve above the discharge pipe is stuck. Test this every spring before heavy rain season—not during a storm when it's already too late. --- **Q: What size water heater do I need for my house?** **A:** For a 2-person household, a 40-gallon unit is sufficient. Family of 3–4, go with 50 gallons. Family of 5 or more, you need a 75-80 gallon unit or a tankless system. These are first-hour recovery ratings, not just tank size—check the FHR on the label, not just the gallon capacity. Two back-to-back morning showers, a dishwasher cycle, and a load of laundry will drain a 40-gallon tank dry for a family of four. --- **Q: How do I fix a running toilet?** **A:** Lift the tank lid and identify what's happening. If the flapper isn't seating properly, replace it—it's a $5–$12 part at any hardware store and a 15-minute job. If the float is set too high and water is spilling into the overflow tube, bend the float arm down or adjust the float ball so the water line sits 1 inch below the top of the overflow tube. If both look fine and it still runs, replace the entire fill valve. A Fluidmaster 400A is the industry standard—$12 at Home Depot, 20 minutes to install. --- **Q: How much does it cost to replace a sewer line?** **A:** Full sewer line replacement runs $3,000–$8,000 for a conventional open-cut job on a typical residential property with 50–100 feet of line. Trenchless pipe lining (CIPP) runs $80–$250 per linear foot but avoids tearing up your yard. Trenchless pipe bursting costs $60–$200 per linear foot. Get a camera inspection done first—$150–$300—before anyone quotes you a replacement. Half the time a full replacement isn't necessary, and a plumber who recommends it without a camera first is guessing with your money. --- **Q: Why does my hot water smell like rotten eggs?** **A:** That sulfur smell is almost always caused by sulfate-reducing bacteria reacting with a degraded magnesium anode rod inside the tank. The fix is to replace the anode rod with an aluminum/zinc alloy rod—not magnesium. On a Rheem or A.O. Smith tank, the anode rod is typically accessible from the top of the unit under a hex plug. Flush the tank completely, install the new rod, and refill. If the smell returns within a few weeks, the bacteria have colonized the tank and you're looking at a replacement or a chlorination flush of the entire system. --- **Q: How do I winterize my pipes to prevent freezing?** **A:** Pipes freeze when ambient temperature hits 20°F or below and there's no insulation or heat source nearby. Insulate any pipe in an unconditioned space—crawl space, attic, exterior wall cavities—with foam pipe insulation rated for your climate. For pipes in exterior walls, leave cabinet doors open during a hard freeze to let heated air reach them. If you're leaving the house, set the thermostat to a minimum of 55°F and shut off the main water supply. Drain garden hose bibs completely—a frozen hose bib can split the supply pipe inside the wall. --- **Q: How much does a plumber charge per hour?** **A:** Most licensed plumbers charge $85–$150 per hour in mid-size markets, $125–$200 per hour in high cost-of-living cities like Denver, Seattle, or Boston. Most plumbers charge a flat service call fee of $50–$100 just to show up, which applies toward the job. Emergency or after-hours calls add a 50–100% premium on top of standard rates. For any job over $500, get an itemized written estimate before work starts—not a verbal ballpark.