Ever since their introduction, tankless water heaters have become a favorite among homeowners. The benefits of having a tankless system couldn’t be more obvious. They save space and energy, provide on demand hot water and last up to twice as long as units with storage tanks. However, not all tankless water heaters are the same. Different models come with different features and capabilities. A 110v tankless water heater for instance has different power requirements from a 277v unit. It is therefore important to carefully review your options before spending money on any given system.

Things to Consider

100v simply means your system should be plugged into a power outlet that can deliver 100 volts. Most 110v tankless water heater units will require up to 25 amps or more although different systems have different amperage requirements. Some work more effectively when wired to a breaker box or electrical panel while others can be plugged into standard panels. It is advisable to hire reputable professionals to handle installation. You can always check with your local BBB (Better Business Bureau). Apart from amperage, the most important aspects to review when purchasing a 110v tankless water heater include:

Demand Size and Location

Where will you install the 110v tankless water heater? Is it for a single bathroom sink, the entire bathroom, or all fixtures in the house? It is important to note the demand of every fixture and determine which ones will need hot water. Essentially, 110v models are suitable for single point applications like bathroom sinks. You can still find powerful units that will offer a steady supply of hot water on multiple fixtures. The flow rate may however be below par. Ambient incoming water temperature is affected by the location. You should note that incoming water is much cooler in the northern region compared to the warm southern region due to the different in climate.

Flow Rate vs. Temperature Rise

As aforementioned, fixtures have different flow rates. When installing a 110v tankless water heater, you should determine which fixtures require hot water more often. Flow rate is usually measured in GPM (gallons per minute). Typically flow rates for average hot usage are as follows;

Lavatory – 0.5

Bathtub – 2.0-4.0

Shower – 1.5-3.0

Kitchen Sink – 1.0-1.5

Pastry Sink – 1.5-2.5

Laundry Sink – 2.5-3.0

Dishwasher – 1.0-3.0

Flow rate is a very critical aspect of the water heating process. Most 110v tankless water heater systems use the flow rate to generate temperature rise. For instance. A 110v tankless water heater may raise temperature 54°F at 1.5 GPM. If you have the shower and kitchen running simultaneously at 1.5 GPM each, the demand becomes 3.0 GPM and the heater thus generates a 27°F rise.

Installation, Maintenance and Durability

It is recommendable to contract professional plumbers in your area to install your 110v tankless water heater system. More importantly, you should take time to learn how to maintain your system for optimum performance. Check if the model comes with a warranty for parts like the heat exchanger and learn the vulnerabilities of your system. 110v tankless water heaters usually last up to 20 years with proper maintenance.


There are several 110v tankless water heater models available in the market and while finding one is not a problem, making a choice can be a little daunting. The goal is to find units that best suit your needs. Compare your demand for hot water against the unit’s performance to gauge if it will meet your needs. If you’re in the market for a tankless water heater drop us a line and tell us about it.