Tankless Water Heaters Provide Continuous Hot Water on Demand

Plumber Artie McGowan explaining how tankless hot water heaters work.
Plumber Artie McGowan explaining how tankless hot water heaters work.

Tankless hot water heaters, such as those made by Rinnai, heat water as it passes through the unit to provide a continuous supply of hot water on demand. This allows you to fill large soaking tubs without running out of hot water, unlike traditional tank type water heaters which have a limited amount of hot water available on demand.

Watch this video to find out more.

Further Information

Danny Lipford: If you have your heart set on a large soaking tub like this, here’s something you need to think about. Now, if you have a traditional water heater that’s 30 or 40 gallons, and you have a tub like this that can hold as much as a 100 gallons, you’re not going to have that nice, relaxing hot bath that you had planned.

I hear it from homeowners all the time complaining about their large tubs just simply not getting warm enough. I never hear that complaint from any homeowner that has a tankless water heater.

Artie McGowan: The biggest advantage with a tankless water heater is that you don’t run out of hot water. You got a conventional tank, 40 gallon, and you’re trying to fill a tub, you got several people who want to take a bath, you’re going to lose hot water. Somebody’s going to take a cold shower, and nobody likes that. So, Rinnai, the tankless water heater, gives you a solution that is great for the family.

What happens is, as soon as you go to your valve and you turn it on, it’s got a flow switch inside of this here. When that water goes past that flow switch, it says, “Turn on the heater.” The heater turns on, it continuously heats water whenever you need it, at the time you need it.

What I like to do to with Rinnai is, turn on your heat, take your digital control, and move it down to 104 or a 106. Go to that big large tub that you want to take a bath in, simply turn on the hot water side.

In other words, why have water at 120 degrees, coming into the bathtub, knowing you can’t get in there, and then have to cool it down on the cold side, by delivering some cold water with it. So in this case you just turn on the hot water valve and just fill it up.


  1. What about being on a well. I see in the video there are using copper pipe. When we build the house, they always said do not used copper pipes because the well water would and will cause the pipe to fail.

  2. paradisediva50@gmail.com
    I had issues with my waterless tank since it was installed! I get hot water but never enough hotness. It’s like bathing in lukewarm water and in winter months I love taking very hot showers or hot baths and since we had our waterless tank system it sucks!! I’m so mad that I want to just put the other old system back! We called so many different plumbers and nobody is knowledgeable enough about the system!! It’s ridiculous!! What they go to school for?? If there is something wrong that is a quick fix certainly nobody has figured it out yet and I keep waisting my money and I haven’t been able to take a bath again!!! I freeze during winter!! This year makes 2 winters and I’m seriously considering changing back and then earning people thru a review on these systems! And trust me I’m not the only one complaining about this !! So I don’t understand how you can even advertise this as full proof 100% always getting hot water???!! Even in summer it comes and goes like the waves on a beach! Smh! I’m frustrated!


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