Hi @Kat. Thanks for the post and welcome to the Community.
There are different models of solar hot water systems:
The hot water system will be on the roof connected to panels
The panels will be on the roof and the hot water system will be on one side of the house
If you are renting the house, it might be best to speak with either your real estate or landlord to find out what kind of hot water system you currently have installed. If you have just purchased the house, you might still be able to check with the real estate.
An example of a solar hot water system that AGL Appliances and Tradespeople sell is here.