If the oil runs out and results in damage to the system, the tenant will pay for the repair.I also recommend you be clear about this in your written lease for future renters.If there are repeated violations, terminate their lease and start with a new renter.

But each technology needs to show why it should and will be adapted, just like wind and solar have, along with ESS (energy storage systems), in the US market. 

Why can't your tenant send rent via their bank's ACH online payment system to your bank account?

Once you get your systems down, you have a real estate business model that you can take to any market and be still be successful.

Move to an electronic card system even for the soap dispensers. 

My personal privacy is not an issue for me but based on the American legal system, lawsuits being reduced to the status of a lottery, I understand why most prefer to hide.

Once you get your systems down, you have a real estate business model that you can take to any market and be still be successful.

And if you did it on a trial basis, it is relatively easy to switch it back using certain systems. 

It is headquartered here, along with many other hospital systems.

If I had it to do over again I may go the route @Julie McCoy suggests as the up front cost for my two-piece system is (~$175 per lock and $100 for each hub) is substantial and you do have to do a little setup.