tennant
Landlord, but probably only once a year. The landlord should have a tech check the filters.
Landlord.
Most likely this responsibility lies with the landlord, although, if this is a single family residence, the lease may require the tenant to deal with such things. Also, if the tenant caused the problem, then they might be responsible.
The landlord
Yes, the landlord is responsible. But keep in mind that this is not a landlord/tenant issue: it's a small claims issue. So this is heard in a small claims court inquired, not a landlord/tenant court.
If the tenant damaged them, then it's the tenants fault. Ifit was the landlord, then it's their fault
Yes, a landlord can be held responsible for their tenant's actions in certain situations, such as if the landlord knew about illegal activities taking place on their property and did not take action to stop it.
The landlord, because he/she owns the property.
If the tenant made it dirty, he should clean it. If the tenant moves out and leaves it dirty it should be charged against his cle aning deposit. Anything else needs to be spelled out in the rental agreement.
Normally not: every bill in the tenant's name is that tenant's responsibility, not of the landlord.
you will have to read your contract agreement that you signed for the tenant/landlord relationship.
It's just my opinion, but until title changes hands, the tenant is still the tenant, and the landlord is responsible for replacing the water heater.