I explained I will think about it and if I do allow it, they will be responsible for any and all damages and repairs due to malfunction or misuse, which they agreed to.

In your situation I’d probably be empathetic and say I’m sorry that this occurred, then explain to them there is nothing wrong with the electrical system in the house but rather it was the transformer which belongs to the electric utility that malfunctioned, then offer to give them the contact info for the utility in case they want to call them and ask for a new TV from them (good luck with that).

In one case, a water heater was malfunctioning, told her I would buy it that night and come replace the next morning... she was so delighted she paid $150 toward the cost of it!

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).

Either a badly malfunctioning furnace, inept operation of fireplace or could definitely be from the candle burning.

Depending on the nature of her malfunction, there's a small chance she may show up at your house with a gun, and you have to be prepared to deal with that during this process of forcing communication with a crazy person.

The washer and dryer were delivered the day before the first tenant moved in.The dryer malfunctioned in mid-March, and will no longer dry clothes. 

My tenant reported a malfunctioning water heater a week ago.

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