Watersource for RODI from Water Heater?

[MRRBW]

I am looking for recommendations/ideas - just moved into a new house and am trying to plan how to install my rodi. I will have a large tank in the basement in the future, and a nano on the main floor sooner than later. If I hook up my rodi on the main floor in the laundry room, it would be the easiest. Could also shoot some lines straight to the garage for holding tanks as its a common wall. That said though, I’m in Montreal so winters are cold and summers are hot. Should this be a concern? The other place would be to put it in the basement in the furnace room and tie in to the plumbing for the water heater (plumb into the cold water line before going into the water heater. ) This option is interesting as the big tank shares a wall with a crawl space under the stairs that ties into the furnace room. But, plumbing here is difficult and ventilation will be a challenge. Any thoughts?

 

[chipmunkofdoom2]

If you're feeding the RO/DI unit from a cold water line, then it doesn't really matter where the source comes from. You could even put a tee between your toilet and its water source. As long as it's cold water.

You cannot, however, feed an RO/DI system from a hot water line. Your thread title says that the water source for your RO/DI would come from your water heater. This will ruin the RO membrane in short order. As long as you source the water from the cold water input, the one that goes into the hot water heater, then that would be a fine option.

 

[Shaummy]

I am looking for recommendations/ideas - just moved into a new house and am trying to plan how to install my rodi. I will have a large tank in the basement in the future, and a nano on the main floor sooner than later. If I hook up my rodi on the main floor in the laundry room, it would be the easiest. Could also shoot some lines straight to the garage for holding tanks as its a common wall. That said though, I’m in Montreal so winters are cold and summers are hot. Should this be a concern? The other place would be to put it in the basement in the furnace room and tie in to the plumbing for the water heater (plumb into the cold water line before going into the water heater. ) This option is interesting as the big tank shares a wall with a crawl space under the stairs that ties into the furnace room. But, plumbing here is difficult and ventilation will be a challenge. Any thoughts?

If it helps any..I do the second...I already had a valve on the (cold side) feed going into the water heater that sent water to the whole house humidifier so I just added a "T" to that valve and plumbed one side to my RODI and the other went to the humidifier. Hasn't caused an issue at all.

 

[MRRBW]

If you're feeding the RO/DI unit from a cold water line, then it doesn't really matter where the source comes from. You could even put a tee between your toilet and its water source. As long as it's cold water.

You cannot, however, feed an RO/DI system from a hot water line. Your thread title says that the water source for your RO/DI would come from your water heater. This will ruin the RO membrane in short order. As long as you source the water from the cold water input, the one that goes into the hot water heater, then that would be a fine option.

lol I am not sure I would hook it to the toilet, my kids are not the best at target practice yet ;Facepalm
I probably should have been clearer with the title too, but I was aware you shouldn't hook it into the hot side. It's more of a function does it cause problems doing it this way. I also need to figure out how to drain the thing, I can set the waste line into the sump pit, or to the neighboring room which has a bathroom.
At the end, I want to do this once and then never again.

If it helps any..I do the second...I already had a valve on the (cold side) feed going into the water heater that sent water to the whole house humidifier so I just added a "T" to that valve and plumbed one side to my RODI and the other went to the humidifier. Hasn't caused an issue at all.

That's really good to hear. Where do you put your waster water?

 

[Brien]

I know it is recommended the water temp be around 76-78 degrees when run through your RODI system. This usually involves using a little hot water to get in that range. The problem is water from your water heater is the last thing you should be using. It you've ever flushed your water heater you'll know how much rust and calcium deposits comes out. Therefore, it's best to not use any water from your water heater even if that mean using colder water and hence taking longer to fill up.