Which High Temp, Waterproof 2 Conductor Wire for Heater?

Camen

New member
Mar 30, 2019
3
Orlando, FL
Hey folks,

I admit, I'm lazy and don't want to run another conduit from my Hayward H400 gas pool heater to the OnCommand unit (about 15 feet) just for a 2 conductor control wire. So, and this might help others, I bought some high temp 2 conductor wire, and hooked it in. Everything was fine until it got wet and now the fiberglass insulation apparently has 'just' enough moisture in it to hold 1.5K ohms of resistance and my dang heater started firing off whenever the wire was attached, regardless of even being hooked up on the other end to the OnCommand.

So... now I'm asking... is there is a high temp wire (rated to be in a gas spa heater) that is also waterproof? Google and amazon searches turn up surprisingly zero useful results when search for high temp waterproof/exterior/outdoor wire/cable - or even just searching for spa heater control wire is useless (you'd think this would be a thing at pool heater part supplies - but it isn't). Is everyone really running conduit with high temp fiberglass wire - or the other extreme and not using high temp wire to their heaters?

I have found high temp silicone wire - up to 200 C. Is that enough of a temp rating to be lose next to the hottest interior parts of the furnace? I'm nervous since no other wire in my Hayward uses silicone insulation in that area (all fiberglass). Again, why the manual doesn't specify this wire type is beyond me.

Any advice is appreciated.

Richard
 
Last edited:

Bama Rambler

Mod Squad
TFP Expert
Bronze Supporter
LifeTime Supporter
Jun 22, 2009
24,094
SouthWest Alabama
According to the manual all external wiring should be rated for 75ºC.
You could use plenum rated thermostat wire for it. CL3R rated cable is moisture and sunlight resistant.
 

Camen

New member
Mar 30, 2019
3
Orlando, FL
Thanks for the response. I suppose what's confusing is that the control wire is both internal and external, since it all terminates at the same internal location. I'll try it, thanks.