Standard Hot Water Heater Size

Determine the home s fhr or first hour rating.

Standard hot water heater size. Look for a sticker on the side of your water heater. 30 40 gallons for 2 to 3 people. Don t opt for a smaller unit thinking that it ll shrink your energy bill. A tankless water heater albeit more expensive upfront will provide you with hot water no matter what.

As an example an instant hot water heater size for family of 5 would be a 21 litres per minute flow rate vs a hot water tank size for family of 5 would be 230 300l 60 80 gallons. Because a continuous flow system supplies hot water on demand and the hot water is endless the most important thing to consider for these water heaters is flow rate. 1 or 2. It should have the serial number and other information as well as the gallon capacity listed.

This is assuming 3 showers running simultaneously with 3 star water saving shower head. The amount of water you use will be the same regardless of your water heater size. Then measure the width. In practical terms this determines how many hot water outlets the system can reliably supply with hot water to at once.

Tankless units work by using built in coils to heat water when you need it meaning you ll always have hot water on demand. Sizing storage and heat pump with tank water heaters. That s the measure of how much hot water the heater will deliver during a busy hour such as first thing in the morning. This is the capacity of your water heater.

This makes these types of water heaters more efficient than traditional storage tank water heaters which could end up reducing your energy bills. For a tank style heater household size is a simple indicator of hot water needs. Using a tape measure measure the height of your water heater from its base to the top. The first hour rating is the number of gallons of hot water the heater can supply per hour starting with a tank full of hot water.

But if you only need a loose estimate of what size you need versus an exact calculation follow these guidelines. Smith pro size sizing program is a tool that can be used to estimate water heater requirements for many common applications. Well to get an accurate answer you d have to calculate out how much hot water you typically use during your busiest hot water using hour. The good news is that just by following a few guidelines you can find the perfect size water heater.

For 1 to 2 people. You can estimate the necessary tank capacity in gallons based on the number of people in the house. Pro size is intended to assist in selecting water heaters or boilers that best meet the specific job requirements.