Residential Plumbing & HVAC Experts

Why Sizing Is Critical When Choosing Your Tankless Water Heater

Homeowners in San Diego and the surrounding areas are becoming more and more energy conscious as utility bills keep going up. A tankless water heater can give great energy savings, but since it only heats water on demand, its important to know you’ve picked the right capacity to keep up with your home’s hot water needs.

So how do you figure out which ones are the right size when looking at what’s available?

Tankless water heaters are rated by the maximum heat increase for a specific flow rate. In order to figure out which one will fit your needs, you first need to figure out the flow rate of any devices you want to be able to run simultaneously, and then how much you need the unit to heat that water. Most tap water requires a heat rise of around 70 to 90 degrees, but that can vary depending on individual circumstances.  So your combined flow rate plus your desired heat rise will give you the optimum size rating for the tankless water heater you’re looking for.

If you add up the flow rates of all your devices, and the flow rate is too fast for your temperature rise, you can buy special low-flow rate aerators and fixtures to put on your faucets to cut down the flow rate. For really high usage households, where multiple people are going to be taking showers at once, or several appliances will need to be using hot water at the same time, you can consider putting in multiple heaters.

One example would be putting one tankless water heater directly next to high usage appliances such as the dishwasher or washing machine and having another parallel heater that provides the hot water for showers or sinks. If you are considering putting in multiple tankless water heaters, it is best to consult with a professional first to make sure that they will be positioned correctly and able to meet your household needs.

For more information on converting to a tankless water heater contact Sherlock Heating and Air Conditioning. We provide excellent service to the San Diego area.