While installing a new one, the homeowner’s mind is on the job. However, you must figure out how to dispose of the old water heater. You might be surprised to learn that there are a variety of choices for repurposing old 40 gallon water heater.
If you hired a certified plumber to install your hot water heater, there’s a high possibility they’ll also assist you in getting rid of your 40 gallon water heater. Many businesses even offer water heater disposal as part of their service.
An outdated water heater can cost anywhere from $35 to $160 to remove, and it can cost as much as $700 (or more if it’s a massive subterranean tank). The cost of disposal varies from $10 to $30, depending on where you live and the size of the heater (30 gallons, 40 gallons, 50 gallons).
It pays to be inventive when it comes to repurposing your heater – literally. Don’t jump to the conclusion that it should be tossed to the curb for some local wildlife to create a new home. Instead, try one of these creative repurposing ideas for your 40 gallon water heater.
It can be used to make a solar water heater.
Yes, you read that correctly. You may easily convert your electric water heater with a good tank into a solar water heater with some clever ingenuity. Simply remove the sheet metal shell and insulation, followed by the electric controls. The tank will then be painted flat black to help it absorb heat better. Read more about 5 Features to Check While Buying House Heaters.
Make a tempering tank out of your old water heater.
Simply connect your cold water line to the inlet of your old water heater and the output of your old water heater to complete the installation. 40 gallon water heater to the inlet of your new water heater. This allows you to connect your old water heater tank to your new water heater. As the cold water arrives, it will accumulate in the old tank, which will gradually warm up to normal temperature. This will also save you money in the long run by lowering your energy use. Furthermore, this type of heating system provides an additional reservoir of water while continuously cycling fresh water.
Make a wooden stove out of your heater.
You can convert your old heater into a wood stove if you’re a skilled Dyer with a torch and a welder. Begin by placing the tank on a set of legs and supporting it horizontally. Construct a wood feed box on the upper half and cover it with a hinged cover. Cut a vent hole on the other side and weld pipe vertically for a flue.
Convert your heater into a barbecue.
Maintain the horizontal position of your old heating tank and cut it in half. Place it on the legs and add a handle and hinges to connect the top and bottom halves. To support grills for cooking, use angle iron. Add a flue to the top and a firebox at the bottom of the chimney. If you use charcoal, your slow-cooking grill or smoker will be ready in no time for 40 gallon water heater.
What Size Water Heater Does Your Family Need?
| Household Size | Tank Size |
|---|---|
| 1 to 2 people | 30 to 40 gallons |
| 2 to 3 people | 40 gallons |
| 3 to 4 people | 50 gallons |
| 5 or more people | 50 to 80 gallons |
A 40-gallon water heater suits a household of two to three people. If you run out of hot water often, your tank may be too small. If you live alone and have a large tank, you may be paying to heat water you never use. The US Department of Energy (DOE) gives sizing guides for both tank and tankless heaters.
Tank vs Tankless Water Heaters
A tank heater stores hot water in a tank and keeps it hot all day. It costs less to buy but uses more energy. A tankless heater heats water only when you turn on a tap. It costs more to buy and install, but it can save energy over time. Tankless heaters give endless hot water, but they may struggle if several taps run at once. A tank heater suits most homes. A tankless heater suits homes that want to save space and energy.
Energy Efficiency: What to Look For
Look for the Energy Star label and the Uniform Energy Factor (UEF) on the label. A higher UEF means the heater uses energy more efficiently. Gas heaters and electric heaters have different UEF ranges, so compare like with like. A heat pump water heater, also called a hybrid, can use much less energy than a standard electric tank. Check the yellow EnergyGuide label for the yearly running cost.
Maintenance Tips for a Longer Life
Flush the tank once a year to remove sediment, which can make the heater work harder and fail early. Check the anode rod every two to three years and replace it if it is worn out. The anode rod protects the tank from rust. Test the temperature and pressure relief (TPR) valve once a year by lifting its lever briefly. If no water comes out, call a plumber. Set the thermostat to 120 degrees Fahrenheit, as the DOE and the Consumer Product Safety Commission advise, to save energy and prevent scalds.
Frequently Asked Questions
What size water heater does a family of three need?
A 40-gallon tank usually suits two to three people. A 50-gallon tank suits three to four people.
What is the difference between a tank and a tankless water heater?
A tank heater stores hot water and keeps it hot. A tankless heater heats water only when you turn on a tap. Tankless heaters cost more but can save energy.
What temperature should I set my water heater to?
Set it to 120 degrees Fahrenheit. The DOE and the Consumer Product Safety Commission advise this to save energy and prevent scalds.
How often should I flush my water heater?
Flush the tank once a year to remove sediment. This helps the heater work well and last longer.
What is an anode rod?
It is a rod inside the tank that protects it from rust. Check it every two to three years and replace it if it is worn out.
Disclaimer: This guide gives general information only. Water heater specs, costs, and safety rules vary by place. Hire a licensed plumber for installation and repairs.
Last Updated: 6 November 2026