What kind of piano to use for a new studio? I really need hlep!!

[sotacad]

HI, everyone:
I am about to start my own piano studio and I am thinking to buy a grand piano.
I don't have any students at this moment but would like to impress my perspective students/parents with a grand piano. Do I start with a used grand piano first or go with a brand new one?( I almost bought a brand new Kawai GM 10k . )  I am thinking to maybe get a used Yamaha GH1 to start with. However, the studio that I am about to take  is more like a warehouse space with 1000 square feet big  and no central heating system ( just portable ones ) which is pretty bad for grand piano. ( maybe even pretty bad for any upright as well ) I thought about inserting heating bar in any piano that I am about to buy but I am not sure how helpful would that be ? So I thought I might as well start with Clavinova CLP 308 that I just bought for a month.
Anyway, any feedback regarding this considering the setting of my soon- to- be studio which is a month to month lease. ( flexible for me to move somewhere else )
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Any opinions/comments/feedbacks would be HIGHLY appreciated!!

BTW, I am in bay area!!

Thank you so much!!!

[silverwoodpianos]

If you cannot stabilize the temp/ humidity in this space then do not purchase an acoustic instrument to put in there until such time as the intermittent heating problem is solved or you re-locate.

Impressing students is not a legitimate reason to purchase a grand piano.