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[junkdump]

I have a 120V 250W PURELY resistive load to control. I do wish to use the "dimming" feature to implement variable power control as well as full on/off capability. Ability to handle up to 300W or more would provide a welcomed operating margin.

I can use a plug in module, but box mounted such as a replacing a dimmer switch would work just as well. There are no mounting restrictions. I would like a list of devices to choose from.

How many "steps" of dimming are available? 8 would be sufficient. 16 great. 32 and I'm in heaven.

If a list cannot be provided then I would like to be pointed to the technical information for each of the modules so I can make an informed selection myself. As for my qualifications I'm a 25+ yr biomedical electronics technician, could do all this myself, but lack the technical data ( IE: schematics ) to get the information from for myself.  That most of the technical data available targets the electrician or typical home owner. 

Best I've been able to gleen so far are references to some modules allowing use of a neutral connection but little further description than that. I'm simply needing a bit more information. 

[Brian H]

X10Pro makes modules that mount inside an electrical box if you didn't want any switch at the installed location. XPDM [memory here] is the dimming one and XPFM is the non dimming relay type.
http://www.x10pro.com .
There is a link to their Users manuals on the page.
X10 also has manuals for all their modules in the Support Area.
I am not at my main computer right now. So I can't post links to more data. Will try later today.
The Neutral wire in the switch box can be helpful in many installations with some loads. The two wire X10 dimmers steal a small amount of power through the load. The ones with a Neutral connection do not and there for can control a more varied types of loads. Though pure resistive probably would not be  a problem.

Found a link here to some automation places.

http://www.x10community.com/forums/index.php?topic=8266.0

[gil shultz]

Since you place no restrictions on the connections most any dimmer would work.  I would suggest that it have a 300W rating just to give yourself a bit of cushion.

Have Fun
Gil

[Charles Sullivan]

The X-10 WS467 Wall Dimmer is rated for 500 Watts Incandescent, and ought to handle the same purely resistive load.

For the WS467 redesigned version introduced in 2007, using Extended Code Preset commands will provide 63 distinct voltage levels, however they're not linear - the lowest "On" level is about 12% of full scale.

The now-discontinued (but still usually available) LM14A plug-in Lamp Module is rated 300 Watts Incandescent and has similar Extended Code Preset levels as the WS467.