Are you considering an electric tankless water heater? 

4 myths about electric tankless water heaters

If you’re considering a tankless water heater for your home or business, consider these four plumbing myths about tankless water heaters before you invest into an upgrade.

Myth number 1 – Electric Tankless Water Heaters Provide Instant Hot Water

Myth busted

Tankless water heaters do not provide INSTANT hot water but what they do provide is ENDLESS hot water.  You can upgrade some tankless water heaters to have a recirculating pump inside of them but many electric models on the market today cannot keep up with the demand of a recirculating pump.  Instant hot water can only be accomplished through the use of a recirculating pump.  The endless hot water that a tankless hot water heater will provide is an incredible feature but be aware, the cold water that is in your water line will still be there so It will still take the same amount of time to get hot water with a tankless water heater as it does with a standard tank style water heater unless you put a recirculating pump in.

Myth number 2 – Electric Tankless Water Heaters Can Be Easily Installed

Myth Busted 

While you may have heard that you can easily upgrade your tank style electric water heater for an electric tankless water heater, let’s be clear.  THIS IS NOT A DIY PROJECT.  That person on the plumbing aisle at your local hardware store that says this is easy to install, is wrong.  Your existing electrical has to be upgraded in order to handle the demand of an electric tankless water heater and your plumbing has to be modified and customized for the new electric tankless water heater.   While there are YouTube videos out there that make this project look easy, it is only easy for an experienced licensed company.  What you don’t know about your install can end up costing you.  Trust your upgrade to a licensed professional for both the plumbing modifications to ensure your system is installed up to plumbing code as well as a licensed electrician to ensure that your electrical line is done up to electrical code and will accommodate your electric tankless water heater.  It is a potential fire hazard to not upgrade your electrical line going to the new tankless water heater.

Myth number 3 – Electric Tankless Water Heaters Don’t Need To Be Maintained.

Myth Busted

Standard electric tankless hot water heaters need to be maintained and flushed on at least an annual basis. Tank style water heaters also need to be flushed and maintained on an annual basis.  The rumor is that since there isn’t water being stored in a tank that a tankless water heater does not require flushing to be maintained and that just isn’t the truth.  Unless you have a self-cleaning model like one of the leading brands we carry here at Robins Plumbing, your tankless electric water heater will require flushing with a descaling solution on an annual basis to clean out sediment and mineral build up from within the manifold.  Your electric tankless water heater will need to be installed with a flush valve kit for this annual procedure. 

Myth number 4 – Electric Tankless Water Heaters Reduce the Flow of Hot Water

Myth Busted

There are a ton of reviews online that state that electric tankless water heaters reduce the flow of hot water, this is a miscommunication that I want to clear up.  Some electric tankless water heaters cannot keep up with demand from multiple plumbing fixtures at once.  While an electric tankless water heater can produce endless amounts of hot water it can only produce so many gallons a minute.  The gallons per minute varies on the brand of the water heater.  For example, the primary brand that we sell produces 7.5 gallons a minute of endless hot water.  A modern shower head has a gallons per minute rating of 2.5 gallons, so at this rate our electric tankless water heater can supply endless hot water to three showers at a time without a reduction in hot water to any fixture.  The misconception comes when someone turns on a kitchen or bathroom faucet and needs hot water and the electric tankless water heater cannot keep up with the demand of the gallons per minute that has now exceeded 7.5 gallons per minute.  The “flow” isn’t reduced of water, just the demand on hot water.  The pipe size and pressure have never changed but the demand on the tankless heater at this point exceeds what it is capable of so the three people that are showering are going to notice a drop in temperature of their hot water, but not the volume of water coming out of the shower head.  


For most homes and general household use our electric tankless water heater exceeds the demands of their lifestyle and they love the endless hot water.  Before considering an electric tankless hot water consider your family’s lifestyle.  Do you have 3 or more people showering at the same time on a regular basis?  Do you have any fixtures with a high gallons per minute rating like a roman tub valve for a large tub? If these two questions were answered with a yes, an electric tankless water heater may not be able to keep up with your lifestyle demands and you may need to have two units installed or consider a hybrid water heater. 

Don’t get me wrong, in the right circumstances I am a big fan of tankless water heaters, I am weary of the cheap brands that are sold online and, in some retailers, due to the poor performance that we see.  We replace cheap electric tankless water heaters after an average of 2-3 years after their original installation.   Those cheaper models also have a lower gallons per minute rating so people notice right away that they can’t use hot water at multiple fixtures at once without a reduction in temp


Tankless Water Heater Services In Phoenix & Beyond

When you need professional drain cleaning services in the Phoenix, Glendale, Scottsdale, or Chandler area, you can trust Robins Plumbing to provide you with prompt and expert service. If you can’t seem to get rid of the smell coming from your kitchen drain, garbage disposal, or faucet, contact our team today. In addition to our drain cleaning services, we also offer a variety of residential and commercial plumbing services, like water heater repair and replacement, sewer camera inspection and locating, backflow prevention, commercial and residential jetting, water treatments, and more. Visit our reviews online to see what others have to say about our local plumbing company!