You walk into a job. Homeowner says the water heater is leaking. You look at it and the water is coming from the top — not the bottom, not the T&P valve. The top. What's your first move? Most guys jump straight to "gotta replace it." But a top leak is usually one of three things: a loose cold water inlet, a bad flex line connection, or a failed dielectric nipple. All three are fixable without swapping the whole tank. If you diagnose before you quote, you save the homeowner $1,500 and you look like a hero. If you jump to replace, you might be swapping a perfectly good tank over a $5 part. What's your go-to diagnosis step when you see a top leak? 👇

You've got your channel locks, your basin wrench, your multi-tool. Cool. But there's one thing I see green guys missing all the time: a simple inspection mirror. Not a fancy borescope. Not a camera. I'm talking about a telescoping mirror that folds flat and fits in your bag. When you're under a sink and can't see the back of that supply line connection because the disposal is in the way — that mirror saves you 20 minutes of guessing. You hold it up, angle it, and boom — you see exactly where the drip is coming from. I've watched guys pull out entire cabinets trying to trace a leak that a mirror would've spotted in 10 seconds. What's one cheap tool you swear by that most guys overlook?

You show up to a service call. Customer says "water under the kitchen sink." You walk in, pull the cabinet doors open, and there's standing water on the cabinet floor. Not dripping — sitting. What do you do first? A lot of guys go straight for the wrench. Don't. Your first move every time is to figure out if the water is STILL coming or if this is leftover. Reach in with a paper towel and wipe an area dry. Wait 30 seconds. Does water reappear? If yes — you've still got active pressure somewhere. If no — the leak already sealed itself and you're dealing with residual. That one step tells you exactly what you're walking into. Active leak means shut-off valve trip first. Residual means you can take your time diagnosing. When you walk into a water-damage call, what's the first thing you check?

Before you leave any service call — water heater, faucet, toilet, whatever — take 10 minutes and run all three fixtures in that bathroom. Sink hot and cold. Tub/shower. Toilet flush. Why? Because you might've knocked something loose during the job. A little piece of sediment, a worn washer, a fleck of solder. It doesn't show up on the fixture you worked on. It shows up in the tub two hours after you left. I started doing this after a callback where a customer said "the shower won't shut off" after I replaced their kitchen faucet. I didn't touch the shower. But something got rattled loose in the pipes. Ten minutes. Run everything. Save the callback. What's one habit you picked up that cut your callbacks in half? Drop it below. 👇

You swap a 50-gallon water heater in a basement. Old one's out, new one's sitting in the dolly. Then you see it — a water stain spreading from under where the old tank sat. You push the new one aside. The floor's soft. Particle board, not concrete. You could set the new tank on it and leave, but you know it'll sag in 6 months, maybe crack a fitting and flood the place.\n\nDo you finish the swap and warn the homeowner? Call and wait for approval? Or eat the time and fix the floor yourself?\n\nI've made all three choices. Two of them cost me money. One of them built a customer for life.\n\nWhat do you do? Drop your move below. 👇