"My water heater died and there's water on the floor." That caller is going to buy a water heater today from somebody. The only question is whether it comes off your truck or the next shop's, and whether the tech who shows up has the right unit in the back.
Nobody comparison shops four estimates for a leaking tank, so intent is not the problem. Detail is. A plumber who arrives with a 50-gallon atmospheric gas unit and finds a 75-gallon power vent in a second-floor closet has spent an hour driving to reschedule. The homeowner spends another night without hot water, and the shop eats the trip.
The intake call decides which of those happens. Here is what to pull out of it.
First: is it leaking right now
Ask this before anything else, because the answer changes both the urgency and what you tell the caller to do in the next thirty seconds.
If water is actively running, give the shutoff instruction and give it plainly. There is a cold water supply valve on top of the heater, usually a lever or a round handle on the pipe entering the tank. Turn it off. If they cannot find it or it will not budge, have them shut the main.
Then the energy source. On an electric unit the breaker gets switched off, because a tank that drains below the elements will burn them out. On a gas unit the control knob on the front goes to OFF, and the gas shutoff on the supply line turns perpendicular to the pipe.
One thing overrides all of it. If the caller says they smell gas, tell them to leave the house and call the gas utility from outside, without touching a switch or a valve on the way. That is a utility call before it is a plumbing call, and it goes in the notes that way.
Once the water is off, ask where it is coming from. A drip at the T&P valve, a weeping fitting, and a split tank seam are different jobs, and only the last one is definitely a replacement. Ask whether it is dripping, running, or already across the floor, and whether the heater sits in a pan with a drain line.
Gas or electric, and how to get the real answer
Half of callers do not know. The other half are wrong, usually because they are describing the furnace.
Do not ask "is it gas or electric." Ask what they see. Is there a flexible metal pipe running into the bottom of the heater with a small box or knob on the front? That is gas. Is there a conduit or armored cable running into the top or the upper side, with no pipe at the bottom? Electric. Is there a plastic pipe going up and out, or a metal flue? That distinction matters and comes up in the next section.
Then confirm the fuel at the house level: natural gas, propane, or all electric. Propane is often a different order code and a different lead time, so if there is a tank out back and the caller says "gas," get that clarified in the notes before anyone purchases anything.
Conversions come up on these calls too. Someone with an electric tank in a house with gas service will ask about switching, and someone with an old gas tank will ask about tankless or heat pump. Log the question, do not answer it with a price. A gas conversion needs a line run and a vent path, and a heat pump unit needs air volume around it, a condensate path, and usually a bigger circuit. Those are site-visit answers.
The data plate photo
Here is the shortcut. Ask the caller to text a photo of the label on the side of the tank, and stay on the line while they do it.
The data plate carries the manufacturer, the model number, the serial number, the capacity in gallons, and on a gas unit the input rating in BTU. That is the majority of the intake sheet in one picture, and it removes the guesswork from a homeowner squinting at a tank in a dark basement. The serial number also gives you the build date on most brands, which settles the age question without anyone doing math about when they bought the house.
Ask for a second photo while they have the phone out: a wide shot of the whole heater and the space around it, taken from a few steps back. That one shows you the vent, the connections, the clearance, and whether there is a pan under it.
Capacity still deserves a spoken confirmation, because a photo can be blurry and a wrong size is the most common reason a truck goes back. Residential tanks are commonly 40, 50, 75, or 80 gallons, with 30-gallon units in condos and utility closets. If the caller cannot read the plate, ask how many bathrooms the house has and how many people live there, and note the number as unconfirmed rather than writing down a guess as fact.
Hear it handled live. Answara's own AI receptionist answers our main line. Call (857) ANSWARA and ask it whatever a customer would ask you, or see plans and get set up.
Venting is the detail that strands trucks
On gas units, this is the question that decides which box goes on the truck, and it is the one dispatchers skip most often.
- Atmospheric. A metal flue pipe rising off the top of the heater into a chimney or a B-vent. No fan, no electrical outlet nearby.
- Power vent. A blower on top of the heater, PVC or ABS pipe running out through a side wall, and a standard electrical outlet powering it. Callers usually describe this one as "it makes a noise when it heats."
- Direct vent. Two pipes, one bringing combustion air in from outside and one taking exhaust out. Common in tight utility rooms and finished basements.
Ask what material the vent pipe is and where it goes. Metal into a chimney, or plastic out the side of the house. That one question separates atmospheric from the powered options, and a power vent replacement is not something you improvise from a truck stocked with standard units.
Two more worth capturing while you are there. If the heater shares a chimney with a furnace or boiler, note it, because replacing the water heater alone can change the draft on a shared flue. And on electric units, ask whether the breaker is a double-pole 30 amp, or just have them photograph the panel label.
Location, access, and what has to fit through
A water heater is a heavy, awkward object that has to travel twice: old one out, new one in. Get the path.
Where does it sit? Basement, garage, utility closet, attic, crawlspace, or a second-floor laundry. Then the route: how many stairs, how tight the turn at the bottom, and how wide the doorway into the room. A 50-gallon tank does not go through a 24-inch closet opening at an angle without somebody figuring that out first.
Ask what is around it. Shelving, a washer and dryer, a finished ceiling directly overhead, a furnace crowding it on one side. Ask about the ceiling height above the tank, because there has to be room to lift the new one and to run the vent. Attic and second-floor installs need a pan and a working drain line, and if there is no pan up there now, that is going in with the new unit.
Then the parking and the door. Long driveway, alley access, a gate the truck cannot get through, a dog in the yard. Small things, but they turn a two-hour job into a three-hour one.
Permits and jurisdiction
Most jurisdictions require a plumbing permit to replace a water heater, and many require an inspection after. Some add a mechanical or electrical permit depending on the venting and the circuit. Get the city or county for the service address rather than the mailing city, because unincorporated addresses often fall under a different building department than the postal town suggests.
Ask whether the property is a condo or townhome under an HOA, and whether it is a rental where the owner is not the caller. Both add an approval step that is better discovered now than on install day.
Local code also drives the upgrades that surprise homeowners. Expansion tanks where the system is closed, seismic strapping in some regions, a pan and drain in certain locations, and a properly terminated T&P discharge line. Note what the photos show, and let the tech confirm what the current code requires.
Being honest about same day
The caller wants to know if they get hot water tonight. Answer the part you actually know.
What you know is whether a tech is available and whether the unit is a stock item. What you do not know until someone is on site is whether the shutoff valves are seized, whether the flue needs rework, or whether the gas line is sized for the new input rating. So say the true version: "I have someone who can be there this afternoon, and if it is a standard 50-gallon gas unit we carry it. If the venting turns out to be something else, we would be looking at tomorrow."
Give an arrival window rather than a time. Confirm whether the caller has to be present. And if the answer is genuinely tomorrow, say so on this call rather than letting them find out at 6pm, because a customer who was told the truth books the tomorrow slot and a customer who was strung along calls somebody else.
The intake sheet worth handing a tech: leaking or not, fuel type, gallons, vent style, age off the serial, where it sits, how you get to it, jurisdiction, and two photos. A dispatcher who captures that sends a truck with the right heater on it. These calls also arrive at nine at night and on Sunday morning, which is when tanks fail and when voicemail loses the job, so if the phone is going unanswered outside hours an AI receptionist can run the same checklist and drop the answers in the morning queue.