Another consideration is how often you are using the machine.
If once a day, it may be worth filling with hot tap water and
solution on a daily basis right before you clean. I used to work in
batches and did this for years. I only cranked up the steam and
ultrasonic right before I was ready to use them.
If you are in and out constantly all day long the immersion heaters
would keep it warm for you but that can be a pain in the neck.
Another consideration is if you need the machine available at all
times… which I do in a retail store… then get another machine and
use this one as a backup. I know they are expensive but not as
expensive as they used to be. $2-250.00 for a small unit. I have a
new spare at the store and an old one at home (which has a dead
FYI, once the machine is turned on, the water will stay hot or get
hotter from the ultrasonic itself.