running hot water through ro/di

[mb167204]

Is this a no no. I have a water hookup that's strickly hot water and was wondering if I could use it or should I do the cold water hook up. Thanks

 

[Toddrtrex]

It is a good way to ruin the RO membrane. So just use the cold hook up.

 

[dwd5813]

<a href=showthread.php?s=&postid=14717203#post14717203 target=_blank>Originally posted</a> by Toddrtrex
It is a good way to ruin the RO membrane. So just use the cold hook up.

+1 i let my tap run for a while even to make sure it's cool water going through the system. here in FL the tap can come out pretty hot at first.

 

[acronuts]

Personally, that would seem like a waste of electricity to me. A normal RO wastes 3 gallons for every 1 gallon it makes. It would make sense to work your hot water heater like that.

 

[Buckeye Hydro]

Feedwater temperatures over 113F void the warranty on Fiilmtec membranes. 113F is pretty darn hot - hotter than you could stand to stick your hand in.

So if you can somehow manage to add some hot water in to your cold feedwater that would be ok.

Also be aware the TDS in your hot water will be higher than the TDS in your cold water - may or may not be much of an issue for you depending upon your water quality.

Russ

 

[jgln]

Are you making tea? :lol:

If you have a choice between the two why would you pick hot? Just curious.

Cold water has to warm up (typically) and hot water needs to cool down so that is a washout tiebreaker. But hot water comes at additional cost. Is it a matter of convenience?

 

[EnglishRebel]

<a href=showthread.php?s=&postid=14723644#post14723644 target=_blank>Originally posted</a> by jgln
Are you making tea? :lol:

If you have a choice between the two why would you pick hot? Just curious.

Cold water has to warm up (typically) and hot water needs to cool down so that is a washout tiebreaker. But hot water comes at additional cost. Is it a matter of convenience?

Because the closer you can get your feed water to 75 degrees and 100 PSIG the more efficient the membrane and less waste water.

 

[Buckeye Hydro]

<a href=showthread.php?s=&postid=14723644#post14723644 target=_blank>Originally posted</a> by jgln
Are you making tea? :lol:

If you have a choice between the two why would you pick hot? Just curious.

Cold water has to warm up (typically) and hot water needs to cool down so that is a washout tiebreaker. But hot water comes at additional cost. Is it a matter of convenience?

Not sure I follow you...

Membranes are speced with 77 degree water. Water colder than that will reduce the amount of purified water produced.

HOT water will ruin the membrane. So some people can successfully mix the hot and cold to come up with feedwater near 77 degrees F.

 

[mb167204]

Wow calm down guys. The tanks home is in an old school building and there was a strickly hot water spot by itself coming out of the wall. I'll pick the cold one that's going to run water to a toilet instead. Thanks.