Key takeaways:
- Tank water heaters keep 30 to 80 gallons of water warm, while tankless models heat up water as needed.
- Tankless water heaters can save on energy and free up space in your home, but flow can be a limitation.
- Airstream Services HVAC, Electrical & Plumbing can help you explore your options for water heater replacements in Middle Tennessee.
Is your water heater getting close to the end of its 8-to-12-year lifespan? If yes, it’s time to start thinking about a replacement.
One question you’ll have to answer is whether you want to get a tankless water heater or a model with a tank. Both have their pros and cons, and knowing more about these differences will help you pick a water heater that matches your lifestyle.
What’s the Difference Between a Tank and Tankless Water Heater?
A tank water heater stores water in a large tank, which can range from 30 gallons to 80 gallons for the largest models. The appliance keeps the water in the tank warm, and your plumbing system distributes this hot water as needed.
Tankless water heaters use a gas burner or electric heating element to quickly raise the temperature of the water flowing through it. In other words, cold water enters the tankless water heater, and hot water comes out a few seconds later. Instead of storing hot water, tankless models heat up water as needed.
What Are the Pros and Cons of Tank Vs. Tankless Water Heaters?
A tankless water heater can provide an endless supply of hot water on demand and can use less energy. However, their flow rate may be too low for your needs. For instance, running your washing machine at the same time you take a shower can be too much for the unit to handle.
On the other hand, tank water heaters tend to be cheaper and easier to install since most Tennessee homes already have the right plumbing and venting for these appliances. You can get a good supply of hot water for your needs if the unit is properly sized for your household, but you’re looking at higher energy usage because tank water heaters continuously keep 30 to 80 gallons of water hot.
| Feature | Tank Water Heater | Tankless Water Heater |
|---|---|---|
| How it works | Heats and stores a set amount of hot water for use when needed. | Heats water on demand as it passes through the unit. It does not store a large supply of hot water. |
| Hot-water supply | Limited by the tank size; your household may need to wait for recovery after the tank is depleted. | Provides continuous hot water as long as the unit is properly sized for the number of simultaneous fixtures. |
| Upfront cost | Usually has a lower equipment and installation cost. | Typically has a higher upfront cost, especially if gas-line, venting, or electrical upgrades are needed. |
| Energy efficiency | Loses some energy by keeping stored water hot, known as standby heat loss. | Can be more energy-efficient. If your home uses 41 gallons of hot water a day or less, you could use 24% to 34% less energy with a tankless water heater. |
| Operating cost | Can be higher because the tank reheats water throughout the day. | Often lower, particularly with an efficient gas model and a household that uses moderate amounts of hot water. |
| Space needed | Takes up more floor space in a utility room, basement, garage, or closet. | A compact, wall-mounted design can free up valuable floor space. |
| Installation complexity | Usually simpler when replacing an existing tank unit with a similar fuel type and location. | Can be more complex and may require larger gas piping, new venting, condensate drainage, electrical work, or changes to water lines. |
| Lifespan | Often lasts around 8 to 12 years, depending on water quality, maintenance, and model. | Can last up to 20 years with proper maintenance. |
| Maintenance needs | Periodic flushing, anode-rod checks, and inspections can help control sediment and extend tank life. | Annual flushing or descaling is often recommended, especially in hard-water areas. Filters, vents, and condensate components may also need inspection. |
| Best for | Homeowners seeking an affordable, straightforward replacement with predictable hot-water needs. | Homeowners who want continuous hot water, more usable space, and potential long-term energy savings. |
Can You Switch From a Tank Water Heater to a Tankless Model?
Yes, most homes can be easily converted, and you’ll get some extra space by getting rid of your tank water heater.
If you’re interested in a gas-powered tankless water heater, a professional will have to run a gas line to the spot where the new water heater will be mounted. For electric models, you might need a circuit upgrade.
A local water heater installer like Airstream Services HVAC, Electrical & Plumbing can assess your situation and give you more details on the kind of upgrades that might be needed to go tankless.
Who Can Benefit From a Tankless Water Heater?
Tankless water heaters can be a great fit if you need to free up space and want to reduce your energy bills. They are especially useful in households where back-to-back showers are common, larger families, and homeowners who often have guests over.
When Is It Best to Keep a Tank Water Heater?
Keeping a tank water heater may be the better choice if you want the lowest upfront cost, have limited space for new venting or gas-line upgrades, or need a straightforward replacement quickly.
A properly sized tank can also work well for households with predictable hot-water use and several simultaneous demands, such as showers, laundry, and dishwashing.
Schedule Your Water Heater Replacement With Airstream Services HVAC, Electrical & Plumbing
As a local plumber, Airstream Services HVAC, Electrical & Plumbing specializes in water heater repairs and replacements in Middle Tennessee. We serve Nashville, Franklin, Murfreesboro, and many communities in the region.
We can discuss your options if it’s time for a new water heater and give you a better idea of the installation process and cost for tank and tankless models. We’ll also help you size your new water heater so it meets your needs.
Give us a call today at 615-216-5979 or book your plumbing consultation online.
FAQ
Is a tankless water heater better than a tank water heater?
Tankless models provide hot water on demand and can reduce energy waste, while tank models typically cost less upfront and are often easier to replace. The right choice depends on your hot-water demand, budget, and available space.
Do tankless water heaters provide unlimited hot water?
Tankless water heaters can provide continuous hot water because they heat water as it flows through the unit instead of drawing from a stored tank. However, they have a maximum flow rate, so an undersized unit may struggle if several showers, appliances, or faucets need hot water at once.
Are tankless water heaters more energy-efficient?
Because tankless systems heat water only when it is needed, they avoid standby heat loss from a storage tank. Some gas tankless models can save about 24% to 34% in energy for homes using 41 gallons of hot water or less per day.
Can I replace my tank water heater with a tankless unit?
Yes, most homes can be converted from a tank water heater to a tankless model. However, a gas tankless system may need an extended gas line, new venting, electrical power, condensate drainage, or plumbing changes. You’ll know more about the required upgrades after a professional assessment.
