Water heater eating X-10 signal

[graftonfot@xxxxxxxxx]

Hello,

I've had a modest X-10 system running in our house for a few years.
It took me a while to get it working reliably enough to get the WAF to
a level where my wife wasn't cursing "HAL" every other day.

Part of that effort involved installing an active phase coupler in our
mains panel.  Everything was working pretty well, until we recently
added an electric water heater to the panel.

The water heater is wired to a double pole 30 amp breaker in the panel
via about 60' of 10/2 w/ground (no neutral connection on the heater,
just the two hots).  After I installed it I noticed that our X-10
controlled outside lights weren't coming on in the evenings.  After a
little troubleshooting I discovered that if I switched off the breaker
for the heater, the X-10 system went back to normal.  Switching the
breaker on makes the problem reappear.

I'm guessing that the connection to heater and/or the heater itself is
"sinking" the X-10 signal.

Is there a wired, in-line filter available that I can fit in after the
breaker to block the X-10 signal from the heater and its wiring?  Is
that the correct approach in this case?

Thanks.