Look at the base for signs of rot, water damage, or "unwanted guests"—holes suggest that rodents might have nested inside during the winter.
Look for frayed wires, burnt marks on the circuit board, or evidence of water intrusion. Electrical failures are among the most common and dangerous hot tub issues. The Ownership Questions what to look for when buying a used hot tub
. If it struggles to climb, the heater may be corroded or near the end of its life. Look at the base for signs of rot,
Turn them on high. Ensure every jet is actually firing with strong pressure. Weak flow could mean air blockages or brittle, failing internal plumbing. The Deep Dive: Under the Panels The Ownership Questions
Look for "gentle weeping" from seals, mineral deposits (white crusty spots), or damp insulation. Leaks in fully insulated tubs are notoriously difficult and expensive to fix.
Ask the seller to remove the side panels so you can see the "guts".
When you first approach a pre-owned hot tub, you are essentially looking at its life story.