Water Shut-off - what do do w/ tankless heater & conditioner?

[finn]

We received notice from the city that they're going to be doing work on the main line this Friday and as a result, all water service will be shut off for the day. We have a tankless water heater system (Rinnai) which has a close-off valve near the unit. Can we make do with just closing the valve for the duration of the work? Or do we need to turn off the electronic unit itself? We also have a water filtration system (Halo) - this system has a valve that allows supply water to enter and treated water to exit - the valve has a normal and bypass position. Is it ok to just set the valve to bypass while the work is taking place or do we need to turn off the electronic unit itself? The water company was not very helpful so any advice would be much appreciated!

 

[breplum]

Kill the power to all equipment.
Often when utility work is done, you can end up with grit in piping so flushing out in bypass mode is best, or just through hose bibb at service entrance first.
Tankless units have cold water inlet filter, so check on that afterwards just for kicks.

 

[finn]

Ah, ok! Was hoping we might be able to get away with just closing the valves! Thanks for the expert advice!

 

[finn]

Now that I think of it - should we turn off the two units AND close the valves?

 

[Twowaxhack]

If you have a circulator pump you should turn it off.

Other than that, I wouldn’t do anything.

Have a great day.

 

[finn]

We don't have a circulator pump but now I'm confused when you say we shouldn't do anything. The Water Co. notice recommends "turning off any water circulation system for instantaneous heating." I assume that means a tankless heating system. So do we (1) power off the actual electronic tankless water heating unit; (2) close the shut-off valve; or (3) do both?

And for the Halo water filtration system, do we (1) power off the actual electronic unit; (2) set the valve to "bypass"; or (3) do both?

 

[SHEPLMBR]

I suggest doing as Breplum says. It won't hurt if you do this, but could hurt if you don't. Flushing the system after the work by taking off your aerators and shower heads, if you have a shower only, and running the faucets is a good idea.

 

[Twowaxhack]

We don't have a circulator pump but now I'm confused when you say we shouldn't do anything. The Water Co. notice recommends "turning off any water circulation system for instantaneous heating." I assume that means a tankless heating system. So do we (1) power off the actual electronic tankless water heating unit; (2) close the shut-off valve; or (3) do both?

And for the Halo water filtration system, do we (1) power off the actual electronic unit; (2) set the valve to "bypass"; or (3) do both?

They’re telling you the same thing I’m telling you.

If you have a pump that circulates hot water, make sure it’s off.

Other than that, I wouldn’t do anything.

Turning off things isn’t going to stop any trash or debris they let enter the line.