How to size and select a proper expansion tank

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Sizing an expansion tank
Different kinds of expansion tanks
Amtrol expansion tanks
Extrol expansion tank
Fill-Trol expansion tank
Calefactio HGT-30, the Watts ETX, and B&G HFT series
Relief valve discharge
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Опубликовано:

5 сен 2017

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Комментарии : 30

@PBS-nm1uu 5 лет назад

thanks great presentation !!

@Carzineeeeeeeeeee 3 года назад

Can i use a therm-xtrol expansion tank for heating? (By reducing the PSI back down to around 12?) Or would there be issues with doing that? I have an ST-5

@jimertzman7766 2 года назад

how do you determine size for a 199000 btu tanklesss potable heater, closed loop, street pressure is125psi regulated to 85 psi. Heater output temp will be approximately 120-125 degrees

@Mike-vi9do 5 лет назад

I am adding a whole house pressure reducing valve to my plumbing. It is a 2 family house. The cold water feeds both 40 gallon hot water heaters. Do I add the 2 to make 80 gal and use the ST-8 expansion tank, according to the chart ? I will be setting pressure somewhere around 50 to 55 PSI.

@Diehard65 5 лет назад

If you are putting one exp tank on the cold water line feeding both tanks then yes, size it for max expansion capabilities.

@newidinme 5 лет назад

I have a A.O. Smith 50 Gal. 3.0 UEF Heat Pump Water Heater. Static 100 p.s.i coming from the street. Should I use a reduced pressure valve first on cold water in?

@george5120 4 года назад

Yes. Buy a pressure-reducing valve. Chances are that it will come preset to 50 PSI, from the manufacturer. But you should own a water-pressure gauge, regardless. Otherwise, you won't know what is your pressure.

@mmoyer3255 6 лет назад

If the expansion tank is for a boiler, it is important to read the instruction manual first. I bought a larger 4.4 gallon tank that had a 40 PSI charge. My water pressure is 50 PSI. I would have increased the pressure, but read the boiler instructions and the manufacturer said 8 to 12 PSI. I decreased to 10 psi and found that this is what stopped the pressure relief valve from spraying water onto the floor. I suggest reading the manual and save yourself a plumber coming to the house to figure this out.

@Diehard65 5 лет назад

Expansion tanks for boiler systems typically come charged with 20 psi. Tanks for domestic hot water systems typically come charged with 40 PSI.

@btownb4462 5 лет назад

Do tank-less water heaters require a thermal expansion tank?

@Diehard65 5 лет назад

Not if it's used for domestic water use. Since the only time it heats the water is when it's flowing to an open tap. So no closed system to build up pressure. (When used for a hydronic heating system, it is a closed loop and therefore requires an expansion tank.)

@mikebumgardner2483 4 года назад

@@Diehard65 If the on demand water heater has a circulating pump and piping an expansion tank will be necessary. It would be maintaining hot water in a closed loop system

@Diehard65 4 года назад

@@mikebumgardner2483 true

@DoomSlayer971 8 дней назад

Don't know man, honestly you should call a professional. I have a tankless water. I use one in my system, but it's mine. I also use well water, so don't rely on what others use. Find out what works for your system. So "Stop it get some help"

@jtashiro1189 4 года назад

basic, but plenty of necessary info. exactly what i like to have. no less, no more

@Casca-su3ty 3 года назад

To all home owners you DO NOT NEED this if you're wster pressure is below 80 psi dont let them thieving plumbers tell you you do

@Multidimensionaltravel 7 месяцев назад

Please back that up with facts. Unless there are none and you are not just venting because you were taken advantage of by a dishonest licensed plumber.

@Casca-su3ty 7 месяцев назад

@@Multidimensionaltravel look gullable human. Plumbers and the city work together the city comes up with all these city codes where they create a way to take money from you. I own 3 homes with none of this expansion cylinders just THINK 🤔 we have been using tanks without them for decades and work fine but you're a grown man/ woman you do what you got to do good luck 👍

@henryt9254 6 месяцев назад

WHY

@jjann54321 2 дня назад

@Casca-su3ty And when the unit fails inspection please update your comment... Also... Fun fact, when you heat water it doesn't care about pressure, it expands... If you have a closed-loop system, this can/will cause issues over time.

@Casca-su3ty День назад

@@jjann54321 read the coment above good luck

@Brickcellent 5 лет назад

Boiler doesn't even give capacity, even in the technical information what the fuck

@RobertELee-uc7em Год назад

dude needs another set of hands for talking

@brianspencer9806 Год назад

Stop telling people to over size their tank, that is lazy. The reason for engineering is to get what you need and no more. The sad part is that in many locations these tanks are required by code but are an absolute waste of money because like in my case I have an open system with no back flow preventer, so mine is all for show anyway and

@jjann54321 2 дня назад

@brianspencer9806 But if you live in a house that wasn't built in the 50s-90s or it's been re-piped there's a 99% chance you will have a backflow preventer and in many locations (in the US) an expansion tank is required by code. It's crazy how people will spend $600-1,500 on a hot water heater with Wi-Fi leak detection but they won't spend approx. $80 on something that there's no reason not to have. Not to mention that emailed leak notification you got is probably due to over expansion/pressure in the hot water tank and could/would have been prevented with an expansion tank installed. And going one more size up is usually about $30 as in the case for the ST5 vs ST8... I hope that helps someone.

@brianspencer9806 9 часов назад

That is what I said, if you have an open system, which many many if not most of the houses have because we have been building houses that way for 100 years before they decided to add backflow prevnters, thus thos code for everyone is only needed for a few. I did however finally find in the code that it is not required if you have an open system, but the stupid inspectors don't even know that, so you have to teach them how to do their job and show it to them. There is no reason at all to install completely unnecessary equipment and say its a good idea. If nothing else, its one more thing to fail.