No tap in this one!! Japan has moved to panels years ago (I remember those already in 2002). You set from your panel the temperature you wish and how much you want it to fill up. Then, you may reheat it and keep it at temperature, you may also cover the bath for the next day and reheat! Remember that the bath in Japan is daily and is to relax, you wash in the shower, and then enjoy the bath.
I spent 2 weeks carrying all the notices of the appliances around as it was so sophisticated. I am getting better at it (maybe I do everything wrong but just have not realised) but the fridge still is daunting and I have purchase small stickers where I have written the translation into English for all the buttons! Et voila!!