Phyllis Theermann

If your hot water is too hot to touch and you have to mix it with cold water, then you’re wasting money and emissions.

Most of us never adjust the temperature of the hot water in our house, but this is easy to do and can have a big impact.

Although some manufacturers set water heater thermostats at 140ºF, most households usually only require them set at 120ºF. Water heated at 140ºF also poses a safety hazard—scalding. However, if you have a dishwasher without a booster heater, it may require a water temperature within a range of 130ºF to 140ºF for optimum cleaning.

Reducing your water temperature to 120ºF also slows mineral buildup and corrosion in your water heater and pipes. This helps your water heater last longer and operate at its maximum efficiency.

While there is a very slight risk of promoting legionellae bacteria when hot water tanks are maintained at 120 degrees, this level is still considered safe for the majority of the population. If you have a suppressed immune system or chronic respiratory disease, you may consider keeping your hot water tank at 140 degrees. However, this high temperature significantly increases the risk of scalding. To minimize this risk, you can install mixing valves or other temperature-regulating devices on any taps used for washing or bathing.

Consult your water heater owner’s manual for instructions on how to operate the thermostat. You can find a thermostat dial for a gas storage water heater near the bottom of the tank on the gas valve. Electric water heaters, on the other hand, may have thermostats positioned behind screw-on plates or panels. As a safety precaution, shut off the electricity to the water heater before removing/opening the panels. Keep in mind that an electric water heater may have two thermostats—one each for the upper and lower heating elements.

Mark the beginning temperature and the adjusted temperature on the thermostat dial for future reference. After turning it down, check the water temperature with a thermometer at the tap farthest from the water heater. Thermostat dials are often inaccurate. Several adjustments may be necessary before you get the right temperature.

Plan to be away from home for at least 3 days?

If you are going away, turn the thermostat down to the lowest setting or completely turn off the water heater. To turn off an electric water heater, switch off the circuit breaker to it. For a gas water heater, make sure you know how to safely relight the pilot light before turning it off.

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Phyllis Theermann

Wellesley get it’s own Farmers’ Market!

Come enjoy organic local produce and specialty crops Every Thursday from 2:00 – 6:00 pm from May through October at 442 Washington St (Rte 16) parking area at Whole Foods Market.

Fresh Strawberries & Snap Peas

Each week farmers display colorful, local, seasonal bounty right in our backyard. Choose from a variety of just-picked fresh fruits and vegetables, to award-winning farmstead cheeses, artisan breads, jams, pickles, flowers and plants, herbs and much more.

Look for market programs and special events designed to engage and delight shoppers of all ages.

Phyllis Theermann

To reduce your expenses and emissions you need to understand what they are, knowledge is power!

Here is where to find your energy usage on your bills.


On your National Grid bill you can see your monthly gas usage in Therms halfway down the right hand side.


On your Town electricity bill you can see your monthly electricity usage in kilowatt-hours (kWh) halfway down the left hand side.

Did You Know?

10-50% of household energy is wasted due to inefficient appliances and energy practices. This equates to $400 – $1,000 annually for a typical Wellesley resident.

Significant tax incentives and rebates are available for energy improvements to learn more check out the WMLP Residential Appliance Rebate Program >>>