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[Flyfishjt]

Wondering if I need a check valve somewhere in a system? If so why and where? I've noticed central boiler requires them. Makes no sense to me. If I spring a leak someplace behind the pump in house then it wouldn't matter if I had a check in place on return side because the water still going to be pushed into the house via the pump. Also how accurate are strap on thermometers verses the plumped in thermometers. (Less cuts the better in my world)

[Scott7m]

I don't see the point in them in most installs

[yoderheating]

 I use a check valve on all my fill lines to keep from ever having any back flows issues, not that it would ever happen anyway.

[Scott7m]

Yoder, do you mean if you set it up where they can fill from inside the home?!!

[yoderheating]

Yes, do that on every job.

[hoardac]

Yes, do that on every job.

That is very good advice there are some nasty chemicals in the boiler.

[Flyfishjt]

So yoder are you only putting the check valve on the fill line or in the main supply/return line to boiler? I guess I could see putting on fill line to keep boiler water out of domestic drinking water but I'm just not understanding why we would need one on boiler lines. I'm still thinking about putting one on return line at the boiler so I can still backwash exchangers in less that won't work?

[Scott7m]

Backwash?!  Hmmm...  U dont need a check valve on those lines.

Yes he installs a line tied to the boiler loop where it can be opened to allow water into the stove, he puts one there.

[Flyfishjt]

Got it thanks!

[yoderheating]

Yea I always put a cross line between furnace and domestic lines at the hot water heater. I put a ball valve and a check valve. I have no idea how furnace water could back flow into a pressurized system but it gives the home owner a lot of peace of mind.