MicroVax 3900 current draw and heat output?

I'm in the process of thoroughly cleaning my MicroVax 3900 in preparation for installing it in my upstairs computer room. This will be the only "big"* machine up there, all the rest of the iron lives in my semi-finished basement computer room. (concrete floors, plenty of headroom, easy power installation...). The problem is, that my upstairs computer room has always had a bit of a problem with heat and power. I'm installing a second 15amp circuit, but heat dissapation will be limited to the central air conditioning and ceiling fan. So, what I'm wondering is... how much power will a MicroVax 3900, with two RA90's, draw? And similarly, how much heat will it put out? Thanks! -Ian * Note how I put "big" in quotes. I know that a MicroVax 3900 is not a big machine, compared to, say, most of the other Vaxen and stuff I own. But, it's bigger than an SGI Octane, it's bigger than a Macintosh, and it's bigger than the PC's and all the other boxen that live upstairs. So, comparatively, it's "big". Ironically, however, I think it's smaller than my printer.