The team · Systems & energy
Water heater pro
Nobody thinks about hot water until the morning it stops showing up.
What this pro actually does, and when you need one
A water heater pro installs, services and replaces both tank and tankless units, and troubleshoots the failures in between full working order and total breakdown: a pilot that will not stay lit, a tank running out of hot water faster than it used to, a tankless unit cutting out mid shower. Much of this trade's work is replacement rather than repair, because a water heater tends to fail once, all at once, rather than declining gradually with clear warning along the way.
Tank versus tankless is a fit question for the house and the household, not a simple better or worse. A tank is simpler and cheaper to install and is the default in most homes for a reason. A tankless unit takes far less space, can supply hot water continuously, and tends to last longer, but usually needs different venting and more gas or electrical capacity than a straightforward tank swap, exactly where a simple sounding job can turn into a bigger one.
Call for a full inspection when the existing unit is old enough that a failure would be inconvenient rather than catastrophic. Call immediately for any leak at the base of the tank, which typically signals the tank itself is failing, and for any burning or gas smell near the unit.
This trade overlaps closely with both the plumber and the electrician, and a water heater pro is sometimes one of those two wearing a specialist's hat rather than a wholly separate trade. A tank swap is largely plumbing work. A tankless conversion, or any electric unit needing a dedicated circuit, pulls in electrical work too, which is part of why the quote for what sounds like one job sometimes properly involves two different licenses. Knowing which is which before you call saves a wasted visit from someone who cannot complete the whole job.
How to choose one, and where this hire goes wrong
Ask explicitly what venting, gas line, or electrical changes a switch to tankless actually requires before agreeing, since this is the single most common place an underquoted job turns expensive partway through, once the old tank is already out and the house has no hot water while the real scope gets sorted. Confirm licensing and permit requirements directly, since both vary by state for gas and electrical work.
A straightforward tank for tank swap is close to a same day job in most cases, which is worth knowing so you can recognize when a quote has quietly expanded into something else. The most common way this hire goes wrong is exactly that: a job sold as a simple swap turns out, once work begins, to actually be a conversion, tank to tankless or electric to gas, with the real scope and price only surfacing after the old unit is already disconnected, at which point you have very little leverage.
Watch closely for a warranty that sounds generous on paper but excludes labor entirely, leaving you to pay for the visit even when the part itself is still covered. Ask for the terms in writing before the old unit comes out.
Ask, too, how disposal of the old unit is handled, since a full tank holds a genuine amount of water and real weight, and a professional installer includes removal and disposal as a matter of course rather than leaving it for you to deal with separately. Get the total scope in writing before the old unit is disconnected: once a house has no hot water, there is real pressure to agree to whatever is proposed next just to get the water back on, which is exactly the moment a real, upfront scope protects you most. A pro who walks you through that scope calmly, before removing anything, is behaving exactly as they should.
What actually drives the cost
Tank versus tankless is the first and biggest fork. Tankless costs more upfront and typically lasts longer, so the comparison runs over the full life of the unit, not the initial invoice, and a household with heavy, simultaneous hot water demand gets more practical value out of that trade than one that barely notices the difference.
Fuel type is the second major factor. Converting from electric to gas, or adding venting a tankless unit specifically requires, adds real work beyond the cost of the unit itself, and a quote treating this as a minor add on is likely underestimating the job. Access plays its usual role too: a unit in an easily reached utility closet costs less to swap than one wedged into a tight crawl space.
Timing closes the list. An emergency, same day replacement, done with no time to compare quotes, tends to cost more than the identical job scheduled before the old unit fully fails. Knowing the rough age of your water heater and planning ahead is one of the more reliable ways to keep this cost down.
Capacity is a factor worth deciding deliberately rather than defaulting to a like for like replacement. A tank sized for a household that has since grown, or shrunk, is either an ongoing daily inconvenience or a system running larger, and costing more, than the house actually needs, and this is worth revisiting at replacement time rather than assuming the old size was ever correct. Warranty length is the final lever: a longer warranty generally costs more upfront, and whether that trade is worth it depends on how long you plan to stay in the house, since a warranty you move away from before it matters is money spent on someone else's benefit, not yours. A basic like for like tank swap sits at the lower end of this range, while any conversion between fuel types sits well above it.
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