The gregomatic is a HWE with an internal jet hard floor wand, there's nothing special about it.
It's actually a cold water system that uses no chemicals with a particular jet and closed skirt arrangement creating a closed vortex within the head. I have the 800 which was a snip at £9,000.
The factory is in Switzerland but the cheaper prices can be found in Germany and Denmark.
article heremanufacturers siteGerman supplierTo answer the initial question. Yes you can use a standard wand on a hard floor with a silicon glide for normal cleaning if you want to. You will scratch (and may damage) the glide and the vacuum won't be anything near that of a proper floor tool. The floor tool gives you the ability to spray and suck up fluid but gives you better suction and nice squeegee so you can push the dirty water away from the extraction nozzles (LOL). So you might just as well get a George for half the cost of a wand.
If there is a lot of slurry or detritus you can possibly damage the hwe machine, pipes and wand. At the very least it will get mucky and you will definitely have to clean it thoroughly after use if you can ever get it clean. So, imagine if you clean a hard floor at 7 p.m. on Monday and have a carpet clean booked in Tuesday at 7 a.m. I am sure that there will be plenty of time to drive home, clean the machine, hose and wand ready for that beautiful snow white kosset carpet the following day. Strong chemicals can affect the unit with prolonged contact. So use it if you wish at your own risk.
Hard floor restoration is a totally different subject. Would I use my hwe to clean a dirty floor? Yes........
if I had no choice.
Would I use it to extract during marble floor restoration. Only if the client bought me new one!