High water heating costs can take a big bite out of your monthly budget, but a few simple adjustments can lead to significant savings without sacrificing comfort. At bluefrog Plumbing + Drain, our licensed plumbers work with homeowners and business owners every day to reduce energy waste and extend the life of their water heating systems through proven maintenance techniques and smart upgrades.
Set The Right Thermostat Temperature
The most efficient temperature setting for your water heater is 120°F. Many water heaters are factory-set at 140°F, which wastes energy and increases the risk of scalding. Lowering your thermostat to 120°F provides hot water that’s safe and sufficient for daily needs while reducing energy use.
To adjust your thermostat, locate the temperature control dial or digital display on your water heater. For electric models, it’s typically behind a small panel that requires a screwdriver to remove. For gas models, it’s near the gas valve at the base of the tank. Reducing the temperature from 140°F to 120°F can cut your water heater’s energy consumption by 4-8%.
Important safety note: If you have an electric water heater, turn off the circuit breaker before removing any panels. The wiring behind these panels carries 240 volts, which is dangerous. After adjusting the temperature, wait 2-3 hours before testing the water temperature at your tap, as tanks take time to adjust.
Households with immune-compromised individuals may need to maintain 140°F to prevent Legionella bacteria growth, and dishwashers without built-in heaters may require hotter incoming water. Consult your dishwasher manual to verify temperature needs before making adjustments. If you’re unsure about your household’s specific needs, our team can assess your situation and recommend the safest, most efficient temperature setting.
Insulate The Tank And Pipes
Heat loss from your water heater tank and exposed pipes wastes energy you’ve already paid for. This is especially true for older water heaters built before 2004, which often lack adequate built-in insulation. Adding insulation can reduce standby heat loss by 25-45%.
Check The Tank’s Current Insulation
Touch the exterior of your water heater tank. If it feels warm to the touch, it’s actively losing heat and could benefit from an insulation blanket. However, check your owner’s manual first—many newer models already have sufficient internal insulation, and adding an external blanket may void your warranty or create safety issues.
When installing an insulation blanket, measure your tank’s height and circumference accurately. Leave the thermostat, pressure relief valve, burner access panel, and the entire top of gas heaters completely uncovered. These areas need airflow for safe operation. Secure the blanket with foil tape—never use duct tape, which can melt and create a fire hazard. For gas heaters, keep all insulation at least 2 inches away from the flue to prevent combustion issues.
Add Pipe Wrap Where Needed
Insulating the first six feet of both hot and cold water pipes connected to your heater prevents heat loss as water travels to your faucets. Foam pipe insulation costs just $0.50-$1 per foot. Cut the foam to fit around pipe fittings and secure it with cable ties or tape every 1-2 feet. This simple step reduces heat loss by up to 4°F and delivers hot water to your fixtures faster, reducing the amount of water wasted while waiting for hot water to arrive.
If your pipes run through unheated spaces like crawlspaces or attics, insulation also prevents freezing during cold weather—a common cause of burst pipes that we respond to during winter months.
Flush And Drain The Tank Regularly
Sediment buildup at the bottom of your tank forces your heater to work harder and use more energy. These mineral deposits—primarily calcium carbonate and magnesium—separate from water over time and settle at the tank bottom. On gas heaters, sediment creates a barrier between the burner flame and water. On electric heaters, it can bury the lower heating element, causing it to overheat and fail prematurely. Flushing your tank removes this buildup and can improve efficiency by 5-10%.
We recommend flushing your water heater at least once per year, or twice if you have hard water. If you hear popping or rumbling noises from your tank, that’s sediment boiling under pressure—a clear sign that flushing is overdue.
Turn Off Power Or Gas Supply
Before starting, turn off the power or gas supply and let the water cool for 30-45 minutes to prevent scalding. If you’ve never flushed your tank and it’s more than five years old, the drain valve may be corroded shut or break when you attempt to close it. This can cause flooding and requires immediate professional repair. Our licensed plumbers at bluefrog Plumbing + Drain can safely handle older systems and replace faulty drain valves before they cause water damage.
Attach A Hose And Drain
Connect a garden hose to the drain valve at the base of your tank and run it to a floor drain or outside location lower than the tank. Open a hot water faucet in your home to break the vacuum, then open the drain valve.
If the sediment has hardened, you may need to open and close the valve several times to break it up. Drain 3-5 gallons, close the valve, then open it again. Repeat until the water runs clear. If the drain valve becomes clogged during this process, close it, detach the hose, and use a wire coat hanger to carefully dislodge sediment from the valve opening.
Refill Slowly And Restart
Once the water runs clear, close the drain valve and remove the hose. Turn on the cold water supply to refill the tank. Leave a hot water faucet open until water flows steadily without air sputtering—this ensures all air has been purged from the system. Once the tank is full, restore power or relight the pilot light according to your manufacturer’s instructions.
Fix Leaks And Drips Quickly
A faucet dripping once per second wastes over 3,000 gallons of water per year. When that’s hot water, you’re paying to heat water that goes down the drain. More importantly, hot water leaks often indicate failing components that will worsen over time. Fixing leaks promptly can save 3-5% on your water heating costs and prevent costly water damage.
Common leak sources include faucets, showerheads, the pressure relief valve on your tank, and threaded pipe connections. To identify hot water leaks specifically, turn off your water heater for 30 minutes, then check if the dripping stops or slows significantly. This confirms the leak is on the hot water side.
Simple fixes you can handle include replacing worn faucet washers or tightening loose compression fittings. However, some leak sources require immediate professional repair:
Call a plumber right away if you notice:
- Puddles or moisture around the tank base (often indicates internal tank corrosion)
- Water dripping from the pressure relief valve after it’s been closed (valve failure or excessive tank pressure)
- Rust-colored water from hot taps (indicates internal tank deterioration)
- A pressure relief valve that continuously drips or sprays water (critical safety issue)
The pressure relief valve is a safety device designed to open if tank pressure exceeds 150 psi or temperature exceeds 210°F. If this valve activates frequently or won’t seal properly, your tank is operating under dangerous conditions. Never cap or plug a pressure relief valve—call our team immediately for diagnosis and repair.
Consider Installing A Timer Or Heat Traps
Timers and heat traps help reduce standby heat loss through different mechanisms, and combining both strategies can maximize your energy savings.
Choose A Timer For Electric Heaters
A timer automatically shuts off your electric water heater during hours you don’t need hot water, such as overnight or during work hours. The water in a well-insulated tank stays hot for 6-8 hours even when the heater isn’t running. Timers can reduce energy use by 5-12%.
Timers work best for households with predictable schedules. They’re only suitable for electric water heaters—gas heaters with standing pilot lights cannot be turned on and off repeatedly without risking pilot failure. Digital timers with battery backup are more reliable than mechanical models, which can fail during power outages.
Add Heat Traps For Additional Savings
Heat traps are one-way valves or specially shaped pipe nipples installed on the hot and cold water connections at the top of your tank. They allow water to flow into and out of the tank but prevent hot water from rising back into the cold water line through natural convection currents. This stops a continuous loop where hot water escapes and cold water replaces it, even when you’re not using any water.
Most water heaters manufactured after 2002 include factory-installed heat traps. You can identify them by looking for colored plastic nipples (typically blue for cold, red for hot) at the tank connections, or arrows indicating water flow direction. If your older heater lacks heat traps, our plumbers can install them during routine maintenance. This upgrade typically pays for itself within 2-3 years through reduced standby losses.
Adopt Smart Usage Habits
Small changes in how you use hot water throughout your home can add up to significant savings over time. These habits cost nothing to implement but deliver measurable results on your utility bills.
Use Cold Water For Laundry
About 90% of the energy used by washing machines goes to heating water. Modern detergents contain enzymes that activate at lower temperatures and clean effectively in cold water, which also helps prevent colors from fading and reduces fabric wear. Switching to cold water for laundry can save $40-$60 per year.
Take Shorter Showers
Cutting your shower time by four minutes saves 10 gallons of hot water per shower. Install a WaterSense-labeled low-flow showerhead (2.0 gallons per minute or less) to reduce water use without sacrificing pressure—you’ll maintain the same shower experience while lowering your bills.
Always run full loads in dishwashers and washing machines. Modern dishwashers use just 4-6 gallons per load compared to 8-27 gallons for hand-washing the same dishes. If you hand-wash, fill one basin with soapy water and another for rinsing instead of running hot water continuously.
When cooking, fill pots with cold tap water rather than hot water. Cold water actually heats faster on your stove because the hot water from your tank has already lost some heat during storage.
Upgrade To Energy Saving Water Heaters
If your water heater is over 10 years old, showing signs of rust, or requiring frequent repairs, upgrading to an energy-efficient model can cut your water-heating costs by 20-50%. Most systems pay for themselves within 4-8 years.
Traditional tank water heaters remain reliable for most homes. Choose models with an Energy Factor of 0.67+ for gas or 0.95+ for electric—higher numbers mean lower operating costs.
Tankless water heaters heat water on demand, eliminating standby heat loss. They work best for small households, vacation homes, or homes using under 41 gallons daily. Note that installation may require gas line or electrical upgrades.
Heat pump water heaters are 2-3 times more efficient than standard electric models. They pull heat from the surrounding air into the water. Install them in spaces that stay between 40°F and 90°F year-round with at least 1,000 cubic feet of air space. They produce cool exhaust air, which helps in summer but may increase heating costs in winter.
Solar water heaters can reduce costs by 50-80% in sunny climates. Federal tax credits and local rebates often cover 30-50% of installation costs.
Your local bluefrog Plumbing + Drain expert can calculate your peak hour demand, evaluate your home’s infrastructure, and recommend the right system. Proper installation and testing from the start maximizes efficiency and lifespan.
Keep Your System Running Efficiently All Year
Water heater efficiency requires ongoing maintenance that combines regular care, smart upgrades, and daily habits. Our service records show that homeowners who follow a consistent maintenance schedule get 2-4 additional years of service from their water heaters compared to those who only call when problems occur.
Set an annual maintenance schedule that includes flushing the tank, testing the pressure relief valve by lifting the lever briefly to verify water flows freely, inspecting all visible pipes and fittings for corrosion or leaks, and testing water temperature at the tap to verify thermostat accuracy.
Call our team for a professional inspection if you notice:
- Rumbling, popping, or banging sounds from the tank (sediment buildup)
- Water takes noticeably longer to heat than usual (failing heating element or sediment issues)
- Hot water runs out faster than normal (thermostat failure or sediment reducing tank capacity)
- Rust-colored hot water (internal tank corrosion)
- Your heater is approaching or past 10 years old (average lifespan is 8-12 years for tank models)
Small issues caught early prevent expensive emergency repairs and water damage. A small leak that wets your floor today can become a ruptured tank that floods your basement tomorrow.
Schedule a service appointment with your local bluefrog Plumbing + Drain expert. Our licensed plumbers carry diagnostic equipment to test pressure, temperature, and component function accurately. We provide honest assessments about whether repair or replacement makes the most financial sense for your situation, and we back all our work with solid warranties.
Frequently Asked Questions About Water Heater Efficiency
How do I choose the right size water heater for my home’s needs?
The right water heater size depends on your household’s peak hour demand—the maximum amount of hot water you use during your busiest hour of the day. For tank water heaters, a general guideline is 30-40 gallons for 1-2 people, 40-50 gallons for 2-3 people, 50-60 gallons for 3-4 people, and 60-80 gallons for 5 or more people. However, these are rough estimates.
Your actual needs depend on factors like the number of bathrooms, whether multiple people shower in the morning, and appliance usage patterns. For tankless systems, you’ll need to calculate the flow rate (gallons per minute) required to supply all fixtures that might run simultaneously. Our team can perform a detailed assessment of your household’s hot water usage patterns and recommend the optimal size and type of system for your specific situation.
Can I complete these water heater efficiency improvements myself, or should I hire a professional?
Many efficiency improvements are DIY-friendly if you’re comfortable with basic tools: adjusting the thermostat, adding insulation blankets and pipe wrap, installing low-flow showerheads, and flushing newer tanks.
However, call our licensed plumbers for: installing timers or heat traps, flushing tanks older than five years, any work involving gas lines or electrical panels, repairing leaks around the tank or pressure relief valve, and installing new water heaters.
If you’re uncertain about any task or run into unexpected issues, stop and contact bluefrog Plumbing + Drain. DIY mistakes can create safety hazards, cause water damage, or void your warranty. Our team ensures your system operates safely and efficiently.
