Instant hot water heaters, otherwise known as tankless, on demand, or instantaneous hot water heaters, produce hot H2O only as it is needed.
Traditional storage water heaters generate energy losses that cost you money due to the fact that traditional designs continuously run to keep the tank full of water at the desired temperature.
Instant Water Heaters – how they work:
Instant or on Demand Water Heaters heat water directly without the use of a tank for water storage. As such, they avoid the standby heat losses associated with traditional storage models. When a hot water tap is turned on, cold water travels through a pipe into the heater.
In an electric Tankless unit, an electric element acts to provide the heat. In a gas-fired Tankless Water Heater, a gas burner heats the water. As a result, These units deliver a constant supply of hot water, eliminating the need to wait for a storage tank to fill up with enough hot water to use.
Typically, Tankless Water Heaters provide hot water at around 2.5 – 5.5 gallons per min. Typically, gas-fired Tankless units can produce higher flow rates than electric versions.
Smaller Tank fewer models, may not be sufficient for high water usage, and may not deliver enough hot water for a large household. For example, taking running the dishwasher and taking a shower at the same time can stretch a Tankless Water Heater to capacity.
Selecting an Instant Water Heater:
As an alternative option, you could install a “whole house” type Tankless Water Heater or install two or smaller ones, connected in parallel. Individual heaters can also be used for appliances—such as a clothes washer or dishwater.
• Outdoor sink
• Pool house or pool shower
• Remote bathrooms or hot tubs
Before buying a Tankless Water Heater, consider the following:
1. Fuel Type
2. Location, Size, and Demand
A. Type of Fuel Needed:
You will need to select between Electric versions (like Eemax Tankless Water Heaters or Stiebel Eltron Tankless Water Heaters) or Gas-Fired models (like Rheem Tankless Water Heaters).
If you plan to purchase an Electric Instant Water Heater, consider the Electrical Requirements:
• Circuit Breaker
It is highly recommended that you consult with a qualified, licensed electrician to find out what your breaker can sustain and the electrical outlets needed.
If you plan to purchase a Gas-Fired Tankless Water Heater, consider the Gas-Type and Venting Requirements:
You will first need to identify whether your gas type is Natural Gas or Propane.
Next, you will want to find out what the venting requirements are for your selection. There are a few important things to keep in mind when purchasing the gas venting accessories for your Gas-Fired Instant Water Heater.
B & C. Size, Usage/Demand, and Location:
Be sure that you purchase Category III stainless steel (UL1738 certified) venting for your Gas-Fired Tankless Water Heater. And also, always check home building codes to make sure you are up to date. At this point, you would want to contact a home remodeler or contractor to help determine the safest way to install your new heater.
When deciding which Instant Water Heater to buy, you should consider where you will need the hot water. Are you looking for a single point application (like a dishwasher), a room like a bathroom or a kitchen, or a whole house solution? Consult the manufacturer and sales agents of a home remodel stores to get advice on what models will best meet your needs.
For homes that use 41 gallons or less of hot water daily, Instant Hot Water Heaters can be 24% – 34% greater energy efficiency than traditional storage tank water heaters. They can be 8% – 14% more energy efficient for homes that use a lot of hot water, around 86 gallons per day. You can achieve an even greater energy savings of 27% – 50% if you install an Instant Water Heater at each hot water outlet.