It won't make a difference.
Hi, Chris here first time poster!
I am putting a small infloor hydronic system together to heat a small addition. This is to supplement my existing forced air gas system.
I am considering a Marathon hot water heater as the supply and the marathons come with a factory installed vacuum relief valve. My understanding of the vacuum relief is that it will let air into the system should a vacuum occur. Knowing that air in a hydronic system is not desireable should I remove the vacuum relief?
Is there any possible way a vacuum could be created in a closed loop system?
Just leave it. The system is full and under pressure, the vacuum relief doesn't come into play unless you break a pipe. Why in hell's name are you using a water heater to for space heating? Like throwing money away?
This is a one room addition that is open to the rest of the house. House is heated by forced air gas.... The hydronic heat in the floor is just a supplement. On the coldest day so far (14F) the room got down to 57F and I have not even insulated the crawl space underneith or blown in the ceiling insulation of r50.
By my calulations I will only need about 7500 btu's to keep the room nice on the coldest days in my climate (about -13f).
What else would you recommend?