Tankless Water Heater Gpm Needs

For a family requiring 80 gallons of hot water per day that means the tankless system must be able to operate at 2 67 gallons per minute.

Tankless water heater gpm needs.

If you use a lot of hot water around 86 gallons per day tankless water heaters are only 8 to 14 more efficient since they are running more often. A sink may run. You ll need a tankless water heater that can provide a temperature rise of 50 f for about 6 gallons of water per minute. If you don t have original paperwork or a model number you can use a generic gpm number for your type of fixture.

Tankless water heater efficiency is determined by the water flow rates inside your home. Locate this information with gpm estimate charts which are readily available with a quick google search. Below we ve highlighted what size water heater you would need in our example of 6 5 gpm at a 63 f temperature rise. You ll need to raise the incoming water temperature from 40 degrees to 105.

The lowest price you can get for the highest gpm is easily the takagi t h3 dv n that will give you a whopping 10 gpm. So you ll need a tankless water heater that can produce at least a 60 degree rise in temperature at 5 2 gallons per minute. This list includes some of the more common problems that people have with tankless hot water heaters but it is not all inclusive. Gallons per minute gpm is the key when it comes to sizing tankless water heaters.

The answer is simple. Once you have your total flow rate and the required temperature rise you can find the right size tankless water heater for your home. If you don t see the tankless water heater problem you re having here or if you need technical support with your water heater please visit our help desk to schedule an appointment or call us at 866 356 1992. A good rule to follow is this.

Gpm needed sum of all individual hot water appliance gpm rates which run at same time. The temperature of the water coming into the heater the peak demand for hot water in gallons per minute gpm and the heater s efficiency as indicated by its uniform energy factor found in the product specs. Your water heater should be able to supply enough hot water to your home that it can meet daily demand levels within 30 minutes. Remember the maximum flow rate that manufacturers mention in the description is not what you ll get at your place.

If you use less than 41 gallons of hot water per day a tankless heater is 24 34 more efficient than a tank style heater. The best gas option in this case would probably be rinnai v series. You may not need that big of a tankless water heater so make sure you read the whole article.