High volume scald proof tub filler?

Does anyone know of a high volume scald proof tub filler for a tub?
Looking for 15 to 20 gallon fill rate.

Most single handle faucets with scald protection put out 7 gallons.

This company uses high flow faucets, but I can't tell what they are using.

http://www.seabridgebathing.com/

This is for a shower. you might be able to use it on a tub without problems. 18gpm at 45psi. http://groheamerica.com/lib/8/catalogue_p1/gw/lc25/34124000_GW.pdf