I currently have 2 hat water heaters located in 2 separate places in the house. 1 electric and the other is propane ( that use to be solar). The propane tank has been removed because it is located outside right next to a bedroom window, a very dumb location. Now we do not have hot water to the 2 back bathrooms and have considered just using the one and just getting a larger unit. How difficult will it be to tie in the plumbing?