A tankless water heater offers endless hot water and energy savings, making it a smart upgrade for any home. However, unlike traditional tanks, sizing a tankless unit is critical. An improperly sized unit will not keep up with demand, leading to frustrating temperature fluctuations. This guide breaks down the essential factors needed to determine the perfect size for your tankless installation, ensuring optimal performance and comfort.
Calculate the Total Required Flow Rate (GPM)
The first step in sizing is to determine how many hot water fixtures you plan to use simultaneously. Assign an estimated flow rate (Gallons Per Minute or GPM) to each. For instance, a shower might use 2.5 GPM, and a sink 1.0 GPM. Add up the GPM for all potential simultaneous uses to find the peak demand your tankless heater must meet.
Factor in the Critical Temperature Rise Needs
Temperature rise is the difference between your incoming cold water temperature (Inlet Temperature) and your desired hot water temperature (Outlet Temperature). In cold climates like Colorado, the inlet temperature can be quite low, meaning the heater has to work harder to raise the temperature. A large required temperature rise dictates a higher-capacity unit.
Use the Inlet Temperature to Determine Capacity
Inlet water temperatures vary significantly by geographic region and season. The colder the inlet water is, the less GPM a tankless unit can produce while achieving your desired outlet temperature. It is crucial to determine your average winter groundwater temperature—this dictates the minimum required GPM capacity of the unit you should purchase for effective, year-round performance.
Why Professional Tankless Installation is Necessary
Sizing is complex because it involves balancing GPM, temperature rise, and the proper gas or electrical line requirements. Getting the calculations wrong leads to cold showers or an expensive, oversized unit. Everett Plumbing and Drain offers professional tankless installation. We guarantee correct sizing, ensure local code compliance, and provide a flawless, safe setup.
A well-sized tankless water heater delivers convenience and efficiency, but a poor choice negates these benefits. Don't risk a DIY sizing mistake that leaves you cold. Our experts at Everett Plumbing and Drain handle all aspects of the job, from precise sizing calculations based on your home’s specific needs to the final, professional tankless installation. Contact us today for a reliable, energy-saving hot water solution.