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Unfortunately, there could be several causes for this, and more detailed information and troubleshooting will be necessary to make a decision.

First, what makes a boiler come on? A thermostat...

PEX expands 1.1" per 100' for every 10 degree (F) rise. So, if it was say, 3/4" PEX, make the hole an inch & that should suffice.

Laurie,

The type of heat you are referring to is called Hydronic radiant. This has been used in big cities for nearly a hundred years in buildings, going to wall mounted radiators.
It has been...

Local codes may have a distance in mind for attachment, but it could conceivably go 40' up with attachment top & bottom.
The noise comes from it being confined but not immobilized, especially on the...

Wrong nocking point.

Check out "Pumping Away" by Dan Holohan. Actually, just about anything by Mr. Holohan is worth diving into! Great no nonsense writer, and respected in his field.

Stubits,
The sizes you suggest sound right, but you would normally use whatever size you might use in CPVC pipe, if that helps.
I like compression fittings, but crimp rings have their place (tight...

After researching the product if you don't find a pattern, it should be noted that turning the heat on a newly laid tile floor will produce those symptoms. The thinset used to adhere the tile will...

Hmmm..
Its been a while since I have kept a salt water aquarium, but it seems like 12 gallons with that number of fish might be pushing the limits. I kept a 20 gallon tank, back in 1992 which was...

Just so you know where I am coming from, I am tech support for Watts Radiant Suntouch, so my advise is general for all systems, particular for Suntouch!
You can sometimes get away with a GFI outlet,...

If you share a circuit with an electric floor heating system, follow these rules:
NO GFI's allowed on the same circuit.
Make sure the breaker is 25% greater capacity than the maximum draw.
Maximum...

Wow! That sounds like too much. What brand are you using? Most of them (Including Suntouch) pull 1 amp per 10 square feet. 12 watts per square foot.
If you tap into a non GFI circuit, (No GFI's...

hvac1000 is right!
All membranes should be UNDER the radiant cables, whether for crack isolation or water proofing.

Please call Watts Radiant and ask for technical support for hydronic systems: 800-276-2419

Call Watts Radiant and ask about SubRay. 800-276-2419 They will be glad to help!