Under Sink Water Heaters

Under Sink Water Heaters
July 5, 2012 Lorelie
Under Sink Water Heaters

Advantages of Using Under Sink Water Heaters

Under sink water heaters, also called under counter water heaters, point of use water heaters or instant water heaters for sink, are water heaters that are usually installed in kitchen sections or in the bathroom, under the sink or counter, for easy operation and instant access to hot water.  They are normally small appliances that are meant for instant water heating at the home or office, at the point of service.  Under sink water heaters can save you lots of water, energy and money when properly installed and used.

A good working condition under sink water heater can offer lots of advantages for those who use it.  One of the main advantages of using under sink water heaters is that they provide instant hot water to distant fixtures, which can significantly shorten wait time.  With this method, you do not have to go through the effort of running long pipes from the central water heater.  You simply just plug this small water heater near the faucet and you get to enjoy instant hot water.

Purchasing an under sink water heater gives you the following advantages:

  • It is very easy to install as it comes with a quick installation guide.
  • It minimizes your heating cost up to 50% and it also minimizes used energy and water waste.
  • The under sink water heater is typically small in size, lightweight and compact.  It does not take up too much space.
  • The under sink water heater saves you money since it eliminates the need for costly recirculating lines and/or pumps.
  • The under sink water heater efficiently saves water as it is used where it is needed, at the point of use – bathroom sink, kitchen sink, laundry, small cabins, garage, offices, boats and RVs, etc.
  • The under sink water heater typically serves one or two faucets which is mainly used for doing the dishes, shaving, handwashing, etc.
  • Interested buyers can choose from two different types of under sink water heaters – tank type or tankless.  The tank type has a limited tank size which is usually from 2.5 gallons up to 20 gallons, whereas the tankless type can provide an unlimited water supply but with a restricted flow.

If you plan on supplying many fixtures or if you have a greater hot water demand (washing machine, shower, dishwasher), you will require a larger capacity model.

The tankless types typically heat water instantaneously because it flows through the unit and there is absolutely no stand-by heat loss.

  • The desired temperature of the outgoing water can be set by simply using the temperature dial.
  • Under sink water heaters can either be mounted to the wall or they can be floor standing.
  • Under sink water heaters are considered to be appliances that are very reliable, safe and energy efficient.
  • Under sink water heaters possess a compact body and have other easy-to-use features.
  • Under sink water heaters provide a safety feature for safe and reliable operation.

Buying and Installation Tips on Under Sink Water Heaters

When searching for a good quality under sink water heater to buy, it is wise to choose from the popular brands because they have a more thorough expertise regarding under sink water heaters, and they can certainly offer models that have unique and quality features.  The most important criteria when choosing the right under sink water heater are:

  • Incoming water temperature
  • Activation flow rate
  • Water flow rate.  A typical bathroom faucet allows an average 0.5 gpm (or gallons of water per minute); the shower, 1.5 to 3.0 gpm.
  • Heating power in kW
  • Price and warranty
  • Available features such as relief valve for safety, the modulation, and a conveniently situated thermostat

Under sink water heaters are for sale in many online stores.  Buying the actual unit is one thing, but installing it is another different matter.  Below is a simple and quick general installation guide for most models of under sink water heaters:

  • Decide where you want to install the under sink water heater appliance and get it ready for installation.  The under sink water heater unit must be mounted closer to the fixture – under the sink, under the countertop, or inside the cabinet.  Ensure that you will allow appropriate clearance for correct draining, maintenance and service.
  • Gather all the installation tools you will need.  The tools that are typically required are recommended in the manufacturer’s manual such as screwdrivers, an adjustable wrench, etc.
  • Prepare all the necessary plumbing components.
  • Follow the quick installation guide in the manufacturer’s manual that comes with the under sink water heater appliance.  You also need to designate an electrical outlet.  Simply follow the steps for plumbing connections.
  • The under sink water heater must have a T&P valve installed.
  • Remove all the debris and air.   You need to do this after filling the under sink water heater unit with water.  You must run the faucet for a few minutes to get rid of any air bubbles in the water heater.  Never ever put the water heater ON unless you have already filled it with water.  If in case you did, serious damage may occur.

Popular Models of Under Sink Water Heaters

There are many under sink water heater brands and models available in the market today.  They can range from prices $150 to $250.  Listed below are the most popular ones:

  • Bosch GL2.5 Ariston
  • Bosch AE-12 PowerStar
  • InSinkErator W152

Below are other popular brands that offer good quality under sink water heaters:

  • Chronomite
  • Eemax
  • Hubbell
  • Reliance
  • Rheem
  • Stiebel Eltron Tempra
  • Titan


An under sink water heater is an electric-powered water heating appliance that gives instant water heating at home or at the office.  It is a nifty appliance that saves you energy, water and money.  They are typically small, space-saving, efficient, and they provide hot water instantly.  A tank-type under sink water heater has a limited capacity whereas a tankless under sink water heater can provide an endless supply of instant hot water.  They are generally available online and also in stores such as Lowe’s, Walmart and Home Depot.

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