PC Q&A: Expansion Tanks for Tankless Water Heaters
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Published 2022-11-23
It's my hope I can build a quick and (relatively) simple video format to help answer or elaborate upon, the many questions I have the privilege of receive from viewers around the world.
My goal is for this format to less formal and simpler than my usual videos and shorts (don't worry; those aren't going anywhere!). Think of it as your very own Plumbing & Mechanical classroom!
So let's see how this little experiment goes! In any event, please do reach out to me in the comments section to let me know your own thoughts on "PCQ&A" (good or bad!)...or perhaps you have your own question or curiosity. Well, ask away, then, and I'll do my best to address it.
We'll kick off this first Q&A segment with a question from viewer, Fri Sung, who wants to know whether expansion tanks can (or should) be installed onto tankless water heaters as well as traditional tank heaters installed with check valves. For more context, please feel free to have a quick view of my Short on thermal expansion, which you can find right here:
• Stop Thermal Expansion from Tripping ...
MYTHBUSTER WATER HEATER VIDEO:
Also - as promised in the video - here's a You'tube link to a Myth Busters segment, that demonstrates the dire repercussions of excessive pressure buildup in a traditional water heater. I strongly encourage you to take four minutes and watch it; I promise that you'll never look at your water heater the same way again! 😁
• MythBusters - Exploding Water Heater
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#Watts #Thermal Expansion #WaterHeater
All Comments (21)
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Thank you, your explanation was very clear.
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Very well presented. This was clear and easy to follow. You sir, are a born instructor! Thank you.
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Just wanted to say thanks after watching couple of your other vids, copper flaring and swaging. Very helpful!
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Thanks. Very clear explanation of why.
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Totally makes sense--Thank you for the video
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Thank you for this video. A plumber just suggested that I get an expansion tank installed just this morning!
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Great explanation. Very very helpful diagrams.
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Thank you, informative, information I needed.
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Great video. I thought you had missed one thing. There are check valves withing the tankless water heater that I would have thought meant you have to put the expansion tank on the hot water side. However, looking at your diagram the thermal expansion that does occur with the recirculating loop is still relieved by the expansion tank on the cold water side. Thanks for the video.
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Thanks so much for explaining this!! My townhouse has an expansion tank with my Rinnani on demand water heater so I wonder why they built it this way! I’m at 7200’ elavation
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Thanks
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Does the expansion tank need to be installed on the cold side before the water heater or on the hot side after the water heater? Thanks! Awesome videos! Merry Christmas! 🎄🎁
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Great video! I have a tankless system with an expansion tank thats bladder has failed ( small black particles coming out from the tubs hot water faucet while filling the tub). Can I just have the expansion tank removed or should I have a new one put in to replace it? Thanks so much!
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very good video, does the expansion tank have to be on the warm side of the tank? Would the cold like be fine aswell as previously with expanding back out to the utilities?
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thx for the explanation. why the small instant hot water heaters for kitchen require an Open Vent faucet? (what exactly is an open vent faucet?) And is it ok to install a bladder and use a regular faucet?
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great video. would love for you explain reverse plumbing or first in last out in a cascading tankless hot water setting. lets say you install 3 units in a row, does the master unit always fire first or does reverse plumbing prevent this and units will alternate? or is it all software? thanks for your insight.
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Are check valves usually visible? Also, I was gonna install the NPE-240A2 with a recirculation pump built in and a sensor valve installed under my sink. Do you think I need an expansion tank with this set up?
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A little off topic but how do you feel about on location instant hot water heater's such as under the kitchen sink. Any suggestions or maybe a video? Good video by the way.👍🍻
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Hello, I somewhat understand. I'm looking to install a tankless water heater for my home. It's a navienA2 series (with a recric in it) no dedicated recirculating line (going to install a bypass under sink). No check valve on line. Only for domestic water. Do I need an expansion tank for the water heater? (Sorry for all the info, I figured it would help).
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We installed an electric tankless water heater for a bathroom in a metal building. when we turn on the hot water , it spits and surges for several minutes and then runs normally. Is there anything we can do to get rid of that issue?
