just trying to avoid both appliances operating at the same time. thats all.
the idea was to use 1 circuit efficiently. only way to do this is to use a device that cuts out one when using the other as is commonly done in electrical installations. even the neutral is used similarly, right? each phase gets to use it alternately.
imagine leaving instructions for a family to be sure the water heater switch is off before using the disposer switch
wont go there, so i wont wire it to allow both to be on at the same time, even if that draw were within 80% of the 20 amp circuit capacity. i'm still trying to understand your concern about a 3-way switch not having an off position, its a matter of persective. it is "off" for the disposer one way, then "off" for the heater the other way...... so maybe you're thinking now that this installation is waaaaaay "off"
i'm not trying to cut a corner just to make $, was just looking for an efficient use of materials and to save customer $ at the same time. joes opinion is its "not a normal way" to disconnect and might be hard to understand. marks opinion, its a "bad idea" for a wiring arrangement and use of a switch. hoping for something less subjective.
thanks for your JMO mark and joe[i'm sure you guys know a lot more than i do], hope i didnt disappoint or offend you and joe or anyone else[and i wouldnt want anyone reading or lurking to use this idea if it is a poor installation method, i'm just not convinced yet]