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Just be extra careful when using the "o"ring/compression,or "QS",type fittings from Uponor.....the o-ring can get pinched really easy and if the PEX isn't cut square and fully inserted into the QS...

The installation should have had an air eliminator at the top op the systen at the hydro-coils........I like to use these....

The Spirotop® Air Release Valve is essentially the vent head used on...

sounds to me like a wiring problem........here's how it should be...from the
"R" terminal of your 24 volt transformer,up to the "RH" terminal on your thermostat,from "W" on the t-stat to one of the...

is the pump installed in a position with the rotor in the verticle position??if so it is in wrong.air can get trapped in the rotor housing........as far as cavity,i think you mean cavitation,this can...

You do not need a ZVC...use a SR 504,not a 503....wire the 3 thermostats and circulators to the relay as the instructions show......now in place of the ZVC get a 24volt,40va transformer and wire like...

one word......PEX

the acid will indeed have a reaction with the copper......there should be a neutralizer on the condensate line before the pump,but my concern is more with freezing of the pump discharge line in...

Remove the trap and look into the outlet side of the u-bend,does it have 2 little protrusions?If it does then the union portion of the trap is 2 pieces,it should be like the spud of a radiator...

how about a two hole galvinized pipe strap bolted directly to the wall that the pipe is so close to?

One point here about those flexi connectors.....if you over tighten them you can distort the gasket or even worse cut the gasket on the end of the male threads.I like to use a small amount of thread...

First off I think you mean ball valve not balcock.....secondly if you are going to be soldering in a new valve then get a "slip" coupling (not slide over coupler) as well and just cut the pipe longer...

have you looked into a combi unit like a Baxi Luna?

you mention 1000 ft with no splice....!!!!!!! you can not run that kind of length.......your maximum run should be no more that 300 feet with 1/2" tubing..otherwise your radiant will NOT...

try using a coupling.....
http://www.missionrubber.com/Products/BandSealCouplings.php#BWT
...a T215 should do it