Somewhere in the kitchen drawer, or in the folder Mom kept on the shelf above the phone, there is probably an envelope that mentions the water heater. You may not have opened it since the day it came. Dad has probably never opened it at all, and if you ask him where it is, he will tell you the heater works fine and that ends the conversation.

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What to do tonight

If you smell gas near the heater, or if there is water on the floor around the tank, do not go looking for paperwork. If it is gas, leave the house and call the gas company from outside. If it is water, shut off the water supply valve at the top of the tank and turn off the power or gas at the unit, using the switch or valve your father already knows. Once things are safe, find the envelope.

Find the two dates

A water heater warranty usually starts on either the install date or the manufacture date, and the paper will say which. Look for the label on the side of the tank and write down the model number and the serial number. The manufacturer uses the serial number to check the build date. The installer's invoice or the store receipt shows the install date. If the two dates do not match what the paper says, keep the install receipt and the warranty card together in the same envelope.

Read what is covered, line by line

Most water heater warranties split into a tank part and a parts part. The tank warranty is usually the long one, and it often covers only leaks from the tank itself. The parts warranty covers items like the valve, the thermostat, or the burner or element, and it often runs for a shorter time. Labor is a separate line. On many of these papers labor is not covered at all, or it is covered only for a short window. Read that line before you assume a free repair means a free visit.

Check who has to do the work

Some warranties say the repair must be done by an authorized service company. A repair by a friend of a friend can void the claim in that case. Others ask for work by a licensed installer in your area. Call the manufacturer's customer line and ask which companies are authorized near your father's house. Write the names down before you call anyone. Ask whether the service visit has a fee, and whether that fee is taken off the bill if the unit is covered.

Read the maintenance line

Many tank warranties ask the owner to keep up routine care on the schedule the paper gives, such as flushing the tank or keeping the pressure relief valve in working order. If the paper asks for this and the house has not had it done, the company can deny a claim on that ground. Decide whether you or a plumber will do the check. Write the date of the last service on the back of the envelope so the next person knows where things stand.

Make the claim in order

Call with the model and serial numbers in front of you. Ask for a claim number and write it on the envelope. Take a photo of the label and of any water or damage. Keep notes of every call, including the name of the person you spoke with. If the company says it will send someone, ask for the arrival window and ask them to tell you in writing what they will check. If they say the unit is not covered, ask which line of the paper says so, and ask them to read that line to you.

Repair or replace

When the answer comes back, you have a real choice to make. If the tank is leaking, the warranty decides whether a replacement is free or partly paid, and that changes the comparison. If only a part failed, a covered part may be the whole job. Compare any replacement quote against the covered options on paper, not against what someone said on the phone. Ask each quote to name the tank size, the warranty length on the new unit, whether removal of the old unit is included, and whether the installer will register the new warranty in your father's name.

The good-week card

On a good week, sit down together with the envelope and a pen. Read the three lines out loud: the tank line, the parts line, and the labor line. He may remember more about the install than you expect, and you can write what he says on the card. That is one small thing done, and it counts.