I brought a large gas BBQ form UK and no problems with fitting you have to use a spanish regulator.
You have to get a licence (about 100€) so they say.
Bottles can be purchased from Fuel Stations some dont ask to see yopur licence.
Regulators easily obtained from DIY shops.
What i would say is a gas BBQ on most solariums may keep blowing outit can be quite windy here quite a few of our friend have opted for the charcoal version for this reason.