To your note about the tenant complaints, (usually) the only two times I see tenants get involved in those matters are if their quality of life is affected by a building malfunction or if they're what I would call "professional" tenants.

@Rufaro Chirewa all it will take is one system malfunction or a large capex repair for this deal to be an absolute bust, not that it isn't already.

We have a lockbox with a key for backup in case the electrical part malfunctions.

Any damage caused by improper maintenance of the appliance or its malfunction will be repaired by the Landlord at the undersigned Tenant(s) expense.Tenant’s clothes washer and dryer will only be used by the legal occupants of the rental unit (as determined by the signed Lease Agreement, referenced above).

I also feel like it's a good way for me to check in on the property in an appropriate way & opens a line of communication pretty regularly throughout the year with my tenant in case something is malfunctioning or not working right.

Three weeks ago the tenants reported that the pool/spa heater is malfunctioning.

In the interim, I want to practice some of the basic repair skills that I'll need to draw upon to be the sort of landlord who doesn't have to blow cash on a contractor every time the tiniest thing malfunctions. 

I have one outdoor jacuzzi in one of my rent houses and the saving grace is the renter is mechanically inclined and has fixed it when it had little malfunctions which is great for me.

There is serious potential to start a fire if there is a malfunction of the breaker or actual wiring issues.

What happens if the battery dies or the system malfunctions?