In the future, however, it is important that you be sure and not place anything flammable near the heaters.Regarding your request for reimbursement for the damage to your sofa: that is they type of thing that would be covered by a renters insurance policy.  

And, you're out of pocket less than $100, which the other party reimburses you if you win - if you ever even end up in front of the judge.It's a way to get somebody's attention and get them to work out a deal.  

If you didn't provide a unit that was habitable, according to the law's definition, then they might be justified in asking for you to reimburse their rent on those days.BUT, they also have to let you know about any problems, and give you time to fix them that is reasonable.I'm betting you don't owe them a dime.This is all assuming that there are no issues regarding their security deposit, which you didn't bring up.I think it's odd that they didn't just sue you in small claims court.  

And I'd ask politely that they rescind their request to have your tenant vacate mid-lease, because if they don't, and you end up in court over the matter with the HOA and the tenant, you will be looking to the HOA to reimburse everyone's attorney's fees.  

@Rick BoslOffer to reimburse her for the water bill if she pays for rent.

A bad review for a STR is going to cost them a whole lot more long term then reimbursing you for your trouble.

left after 3 years and let me know he replaced sprinkler timer and other small stuff, just to let me know it was done, but not asking for reimbursement. 

I work with numerous utility companies in my day job and most have a reimbursement policy around leaks.

The tenant has violated the terms of the Lease.If their pitbull causes Landlord's insurance premium to increase, Tenant needs to reimburse Landlord for the increase.Tenant also needs to provide Landlord with proof of Liability Insurance.Do not take possession of the property until Landlord has removed the Tenant.

Another option would be to tell these guys you expect them to remove their machines and/or reimburse you whatever you might be out of pocket, and you expect them to agree to terminating the contract - or - you intend to begin interviewing class action lawyers.It's not blackmail - it's perfectly legal to "settle" using the leverage of agreeing not to sue in exchange for something.