I personally would not modify the boiler in any way, shape, or form. While it may be electrically possible to achieve what you desire, it's certainly is not recommended, and you know that it isn't the proper way. Some random or fluke failure in your modifications could have unintended consequences that lead to disastrous results.

The next time the hospital wants you to do something that is questionable, what then? If an elevator messes up, are you going to fix it, or are you going to tell them to call Thyssen-Krupp (or w/e mfg you have) and have it fixed properly?