Water Heater Replacement: From Tank to Tankless Full Guide

Are you tired of running out of hot water in the middle of a shower or waiting for your tank water heater to refill? It may be time to consider switching to a tankless water heater. Not only can a tankless water heater provide an endless supply of hot water, but it can also save you money on your energy bills. But what size tankless water heater do you need to replace your old tank water heater? In this article, we’ll explore what you need to know about going from a tank to a tankless water heater and the different sizes you should consider.

What You Need to Know About Going From a Tank to Tankless Water Heater

Before we dive into what size tankless water heater you need, let’s discuss what you need to know about making the switch from a tank to a tankless water heater. One of the most significant differences between the two is the size. Tankless water heaters are much smaller and can be installed in various locations, such as under a sink or in a closet. Additionally, tankless water heaters don’t store hot water, meaning you won’t run out of hot water during a shower or bath.

Another factor to consider is the installation process. Tankless water heaters require a different installation process than tank water heaters, so it’s important to hire a professional plumber to ensure the job is done correctly.

What Size Tankless Water Heater to Replace 50 Gallon

If you’re currently using a 50-gallon tank water heater and want to switch to a tankless system, you’ll need a unit with a flow rate of at least 5 gallons per minute (GPM). A unit with a flow rate of 5 GPM can provide enough hot water for one shower and one sink at the same time. However, if you have a larger family or frequently use multiple hot water sources simultaneously, you may want to consider a unit with a higher flow rate.

What Size Tankless Water Heater to Replace 40 Gallon

If you currently have a 40-gallon tank water heater, you can replace it with a tankless unit with a flow rate of 4 GPM. A 4 GPM unit can provide enough hot water for one shower and one sink at the same time. However, if you have a larger family or frequently use multiple hot water sources simultaneously, you may want to consider a unit with a higher flow rate.

What Size Tankless Water Heater to Replace 75 Gallon

If you’re currently using a 75-gallon tank water heater and want to switch to a tankless system, you’ll need a unit with a flow rate of at least 7.5 gallons per minute (GPM). A unit with a flow rate of 7.5 GPM can provide enough hot water for two showers and one sink at the same time. However, if you have a larger family or frequently use multiple hot water sources simultaneously, you may want to consider a unit with a higher flow rate.