When a home with a water treatment system is sold, or when a unit moves to a new owner, the buyer inherits more than hardware. The records, the ownership status, and the service history decide how smooth the transition is. Plan the handover before the listing or closing, not on the day someone asks for the manual.
Find out who owns the equipment
Some systems are owned by the homeowner, while others are rented, leased, or placed under a service agreement with a provider. Ownership status controls who can remove, transfer, or keep the unit. Read the paperwork you signed, and ask the provider in writing whether the unit can move to a new owner. The terms of your contract and your local rules decide what is possible. This is practical guidance, not legal advice, so take any question about a lease or contract to the person who wrote it.
Gather the paper
Collect the installation record, the manual, the warranty card or registration, the model and serial numbers, the service tickets, any water test results, and the replacement schedule for media or cartridges. Keep them in one folder, paper or digital, and note where the original is kept.
Check what the warranty covers after transfer
Warranty coverage often depends on who the original buyer was and whether the product was registered. Ask the provider or manufacturer whether coverage moves to the new owner, whether registration must be redone, and whether the term continues or restarts. Get the answer in writing, because a buyer who finds out later that coverage has lapsed has no way to check what was said.
Show the buyer how the system runs
Walk the buyer through the basic layout: where the shutoff is, where the bypass sits, where media or cartridges are changed, and which tasks the owner is expected to do. A short written note with the service company name and phone number helps. If the system needs a regular check, such as a salt level or a lamp replacement, write that down with its interval.
Decide what happens to the service agreement
If there is an active service agreement, decide whether it moves with the house or ends at closing. Some agreements can be assigned and some cannot. Ask the provider what the buyer would need to do to take over the agreement, and what happens to any prepaid service if it is not transferred.
Leave a short handover note
End with a one-page summary: the system type, the model, the last service visit, the next scheduled task, and the provider contact. The buyer can keep the note with the folder and start a service log from there.