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Contact Mannix Heating and Cooling for HVAC and Pool Heat Pump Service Today!

Whether you’re dealing with a traditional tank-style system or considering upgrading to a modern tankless unit, understanding your options and maintenance requirements can save you from unexpected cold showers and costly emergency repairs.

Water heaters typically account for approximately 18% of your home’s energy usage, making them the second-largest energy expense after heating and cooling systems. This significant energy consumption means that choosing the right water heater and maintaining it properly can have a substantial impact on your monthly utility bills. Our experienced technicians understand the unique water quality challenges in Gaithersburg, MD, Chantilly, VA, Treasure Island, FL and their surrounding areas and can recommend solutions that not only provide reliable hot water but also optimize energy efficiency for long-term savings.

Tank vs. Tankless Water Heater Systems

Traditional tank water heaters store between 30 to 80 gallons of heated water in an insulated tank, maintaining a constant temperature 24 hours a day. These systems use either natural gas, propane, or electricity to keep water at your desired temperature, typically between 120 to 140 degrees Fahrenheit. The storage tank design means hot water is immediately available when you turn on the tap, but once the tank empties during heavy usage, you’ll need to wait for the system to reheat the new water supply. Tank systems generally last 8 to 12 years with proper maintenance and are ideal for households with consistent, predictable hot water usage patterns.

Tankless water heaters, also known as on-demand systems, heat water directly as it flows through the unit using powerful gas burners or electric heating elements. These units can deliver 2 to 5 gallons of hot water per minute for gas models, while electric versions typically provide slightly lower flow rates. The absence of a storage tank means these systems only consume energy when you’re actually using hot water, resulting in 24% to 34% greater energy efficiency compared to conventional storage tank heaters for homes using 41 gallons or less of hot water daily. If a problem occurs with your heating or cooling system, don’t panic, call Mannix! They have an outstanding reputation for customer service and have some of the most experienced techs in the industry. Just look them up on Angie’s List or read what others are saying about them on Google or Yelp.

Common Water Heater Problems and Solutions

Water heater issues often develop gradually, with warning signs appearing before complete failure occurs. Rusty or discolored water typically indicates corrosion inside the tank or deteriorating anode rod, which serves as a sacrificial component designed to attract corrosive elements away from the tank walls. Strange noises like popping, rumbling, or banging sounds usually result from sediment buildup at the bottom of the tank, where minerals from hard water accumulate over time and create a barrier between the heating element and water.

Temperature inconsistencies represent another frequent concern we address throughout Gaithersburg, MD, Chantilly, VA, Treasure Island, FL and their surrounding areas. When your water heater produces lukewarm water or experiences dramatic temperature fluctuations, the problem often stems from faulty thermostats, damaged heating elements, or improper sizing for your household’s demands. Our technicians perform comprehensive diagnostics to identify the root cause, whether it’s a simple thermostat adjustment, heating element replacement, or recommendation for a properly sized unit that matches your family’s hot water consumption patterns.

Professional Installation and Maintenance Services

Proper water heater installation requires precise attention to local building codes, manufacturer specifications, and safety protocols. Our certified technicians ensure correct venting for gas models, proper electrical connections meeting National Electrical Code requirements, and adequate water pressure regulation through expansion tanks and pressure relief valves. We also install essential safety features including:

  • Temperature and pressure relief valves: prevent dangerous pressure buildup and scalding water temperatures
  • Seismic straps: secure units against earthquake movement in applicable areas
  • Drain pans with overflow protection: prevent water damage from potential leaks
  • Carbon monoxide detectors: essential safety devices for gas-powered water heaters
  • Mixing valves: blend hot and cold water to prevent scalding while maintaining bacteria-killing temperatures in the tank

Regular maintenance extends water heater lifespan significantly while maintaining peak efficiency. Annual flushing removes sediment accumulation, anode rod inspection prevents premature tank corrosion, and thermostat calibration ensures accurate temperature control. These preventive measures typically reduce operating costs by 5% to 10% annually while preventing unexpected failures that could leave your household without hot water when you need it most.

We’re in Your Neighborhood

Whether you’re in Gaithersburg, MD, Chantilly, VA, or Treasure Island, FL, our local teams are ready with 24-hour answering service and experienced technicians who keep your systems running when you need them most.

Gaithersburg, MD

7824 Beechcraft Ave
Gaithersburg, MD, 20879
(301) 260-6000

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Chantilly, VA

26955 Gum Spring Road
Chantilly, VA, 20152
(703) 777-9211

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Treasure Island, FL

10625 1st Street E. Suite 200
Treasure Island, FL, 33706
(727) 999-7002

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HVAC Maintenance

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Comprehensive Climate Control Solutions

Our comprehensive approach encompasses everything from routine maintenance to complete system overhauls, ensuring optimal performance throughout every season. We specialize in both residential and commercial applications, understanding that each environment presents unique challenges requiring customized solutions.

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Customer Reviews
They were lifesavers!!! My furnace went out and after three days of dealing with the home warranty company and the unscrupulous vendor they sent to my home, I called Mannix. The service technician was friendly, efficient but most of all honest. He found the problem after twenty minutes, saving...
Shondra J ones Leave a Review
Customer Reviews
I contacted Mannix from a referral of a friend who has benefitted from the excellent service this company provides. I found out a couple I know in Vienna had their heat pump stop working a few months ago and needed to be replaced. I called up the Mannix office later in the day on Monday 11/30/20...
Lynne Wilson Leave a Review
Customer Reviews
We were in desperate need of a fix on our AC system during the July heatwave. The issue arose on a Saturday. Mannix came to the rescue in short order, fixed it, and at a reasonable price. Silvio G was the technician, and he was GREAT. We would definitely use Mannix again!
Customer Reviews
Mannix proved very responsive in fixing my A/C system. The tech, Erick, was very professional by taking the time showing and explaining to me the system problem prior to taking action replacing the coil. Ashleigh, customer service, was excellent in addressing and following through on concerns in...
Gary Hendricks Leave a Review
Customer Reviews
I have been using Mannix for years. They have replaced my HVAC system and I have them do maintenance twice a year. The past couple of visits have been done by Ramiro. He is professional, polite, knowledgeable, and very helpful in assisting me with tips on the best ways to operate my system. Today,...
Patricia Ryan Leave a Review
Customer Reviews
Before dealing with Mannix I used two very well-known and “reputable” HVAC companies who did nothing but rip us off over the years. I was frustrated and found Mannix Heating & Cooling about 10 years ago. They installed a new HVAC system in my old home, and installed a water...
Customer Reviews
Been a happy Mannix customer for a few years now, but recently had them replace our aging HVAC system. The whole process was very painless, from Eric helping us decide which system was right for our home, to the efficient and professional installation by Billy and Matt. I am very pleased with the...
Philip Slingerland Leave a Review
Customer Reviews
Mannix has always been professional from service calls to repairs and replacements. The technicians are always polite and knowledgeable. They consistently exceed our expectations.
Wendy Collins Leave a Review
Customer Reviews
I’ve been using Mannix for years and have never been disappointed. They’ve replaced my HVAC, hot water heater and installed a humidifier on my furnace. Whenever I need them, they can get me on the schedule in a timely manner. All the personnel are great and I trust Jerry and his team...
Rachel Craft Leave a Review
Customer Reviews
My 24-year-old heat pump finally decided to stop working. I sent a request for a replacement estimate late one night through the Mannix website and received a phone call early the very next morning to set up an appointment. Eric Holzworth stopped by my house the next day to go over my options. He...
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