Great! I'm glad to hear the EtherRain won't add to the heat from the switch

It is an interior wall, so the sun shouldn't be an issue.
I did notice in this post:
http://lawncheck.com/forum/index.php/topic,102.0.html that you recommend keeping the sprinkler wires 6 inches from the ethernet cables, how important is that? That wouldn't really be possible if they are in the same cabinet.
Would using the filters you mentioned in that post help with reliability at all? I'll be running sprinkler wire in three directions, I think the longest run will be about 70 feet.
-larry