4 Factors to Determine the Right Size of the Tankless Water Heater

If you are choosing the tankless models then this post is for your benefit.You can find the tankless water heaters in gas and electrical forms. The gas water heaters are more efficient provided they are well ventilated. Electric tankless water heaters are more beneficial where the hot water demand is less and can be fulfilled with low water flow rate.There are other factors that needs to be considered while choosing the right size of the heater so that you don't end up buying the undersized unit.

Tankless water heaters are usually smaller than the storage tank heaters and can be wall mounted in a small space. In the tankless models the electric ones are usually smaller than gas heaters. Also gas heaters require proper ventilation for the fumes that arise from combustion.

The distance of the faucet and the heater:

The distance of the heater and the faucet also determines the size of the heater. The longer the distance, the water may cool down during the travel. To minimize the loss of heat, the distance must be kept low.

Check the temperature of the cold water :

You need to check the temperature of the cold water that needs to be heated up. So that you can select the heater that can heat the water up to the desired temperature consistently. To check the temperature, you can dip the thermometer in the cold water.

You have to count the numbers you want to connect with the heater, then calculate the GPM (Gallon per minute) or LPM (Liter Per Minute)  of each device and add all together to check the flow rate you desire from your water heater.To calculate the GPM put the jug with the gallon mark and open the faucet to full to fill the jug. If it takes 30 seconds to fill the jug that means you can fill 2 jugs which makes in 2 GPM. Similarly, you can calculate the LPM of the device. use the jug with the litre mark. If the faucet takes 15 seconds then you can fill 4 litres in 1 minute. It means the LPM is 4 for the faucet.Now coming back to the calculation of the GPM of all the devices. If your faucet has 1 GPM and a shower head has 3 GPM flow rate then by adding the two it makes it 1+3=4 GPM flow rate. Now your heater must be capable of producing 4 GPM flow rate.

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