Mixing Valve Checks vs Heat Trap

nj6964

I have an indirect water heater I’ve decided to increase its temp to 140 and add a Caleffi 521519 mixing valve (based on recommendations from HH). I see it comes with or without check valves. I was expecting to have to create a heat trap, but if the mixing valve has checks, do you still need a heat trap? Any advantages/disadvantages? Thanks!

Alan (California Radiant) Forbes

Correct, you don't need a heat trap if you use a mixing valve with checks.
Advantage is you don't have to pipe the heat trap. Disadvantage is that check valves break.

nj6964

Thanks. So from a flow perspective, maybe better off piping the heat trap and not having the added flow restriction of the check valve?

Alan (California Radiant) Forbes

Unless your water pressure is below 30 psi, you don't need to worry about flow restriction.
If you have galvanized pipe anywhere in your house, go with the heat trap. Debris from the buildup and release of minerals in galvanized pipe can damage the check valves.

nj6964

No galvanized anywhere, comes in copper, goes to pex. I think I’ll make life easier and just use the check valves. Thanks!