Water Heater Installation: Sized Right, Vented Right, Installed Once
A tank swap looks like a simple like-for-like. The parts that decide whether it lasts and whether it passes inspection are the ones nobody sees: venting, expansion, pan, straps and connections.
Failed tank? Replacement is often same-day. Shut the cold inlet and the fuel first.
Getting the capacity right
Bigger is not better, and same-as-before is not always right
Two numbers matter. Tank capacity is how much hot water is stored. First-hour rating is how much you can actually draw in the first hour, which combines storage with how fast the unit reheats, and it is the number that reflects a real morning in a real house.
As a rough guide for Georgia households: one or two people, 30 to 40 gallons; three or four, 40 to 50; five or more, 50 to 80 or a tankless unit. Gas recovers considerably faster than electric, so a 40-gallon gas tank often behaves like a 50-gallon electric one.
What shifts the number upwards: simultaneous showers, a large soaking tub, a whirlpool bath, a high-flow shower system, or a household whose whole morning happens within the same forty minutes. What shifts it down: a small household, staggered schedules, or a well-insulated modern unit replacing an old inefficient one.
Oversizing costs money twice, once at purchase and again every month keeping water hot that nobody uses. Undersizing produces cold showers and a heater cycling constantly. Same-as-before is a reasonable default, but if the old unit was always marginal, this is the moment to fix that rather than repeat it.
Check the physical space before choosing
Height and diameter matter in a closet, a garage alcove or an attic hatch. Modern units with thicker insulation are often taller and wider than the one they replace, and a 50-gallon tank that will not fit through the attic opening is a problem discovered at the worst moment.
The type decision
What to fit, and what it costs to change
Fast recovery, lower running cost
Reheats much faster than electric, which is why a smaller gas tank often outperforms a larger electric one. Needs a gas supply, proper combustion air and a compliant flue. Keeps working in a power cut on standing-pilot models. The default in Georgia houses that already have gas.
Simple, cheap to install, slower
No venting, no combustion, fewer things to go wrong, and installable almost anywhere with a suitable circuit. Slower recovery means sizing up. Running cost depends on your tariff. The right answer where there is no gas, or where venting a gas unit would be difficult.
Efficient, fussy about location
Hybrid electric units pull heat from surrounding air and use a fraction of the energy of a resistance tank. They need volume of air around them, produce cool exhaust air and some noise, and need a condensate drain. A Georgia garage or basement suits them well; a small interior closet does not.
Endless hot water, bigger install
Heats on demand, never runs out, and takes up little space. Switching from tank to tankless usually means a larger gas line, a new vent and possibly electrical work, the install cost is the real consideration. See tankless installation.
Changing type changes the install scope. Worth a conversation before you buy anything.
Talk Through OptionsWhere quality lives
The eight things that separate an install from a swap
The tank is a commodity. What determines whether it lasts its full life, passes inspection and does not damage your house is everything around it.
Correct flue, correct draft
On a gas unit the flue must be the right size, correctly sloped, properly connected and drawing. A vent reused without checking, or a unit that backdrafts, is a carbon monoxide risk. This is the item to be least relaxed about.
Thermal expansion tank
Where the house has a pressure regulator or a check valve, most Georgia houses do, the plumbing is a closed system and heated water has nowhere to expand. Without an expansion tank, pressure spikes stress the tank, the relief valve and every fixture. Required by code and frequently missing.
Where the water goes when it fails
A pan plumbed to a drain or outside. Mandatory where a failure would damage the building, which includes any attic or upper-floor installation. It is the difference between a wet patch and a collapsed ceiling.
T&P valve and discharge pipe
The temperature and pressure relief valve needs a full-size discharge pipe run to a safe termination, downwards, no traps, no reduction, no threaded end. It is a life-safety device and one of the most commonly botched details.
Accessible isolation and unions
A working cold-side shut-off within reach, and dielectric unions or approved connectors between dissimilar metals to prevent galvanic corrosion at the nipples, a classic cause of premature leaks at the top of the tank.
Secured, and off the floor where needed
Strapping where required, and in garages the unit raised so the ignition source sits above the floor where vapours from stored fuel could collect. A garage install at floor level is a code issue and a real hazard.
Enough air to burn safely
Gas units in closets need specified air openings. Tighter modern houses and closed utility rooms starve burners, which shows up as sooting, a pilot that will not stay lit and poor combustion. It is a calculation, not a guess.
Old unit taken away
Draining and removing a full tank through a house without damage is skilled awkward work. Confirm haul-away and disposal are in the quote, and that the old unit is actually leaving today, not sitting in your garage.
Paperwork
Permits, inspection and why they are worth having
Water heater replacement is permitted work in most Georgia jurisdictions. Requirements vary by city and county, and the plumber should know the local rules, but a homeowner who asks is a homeowner who gets a compliant install.
What inspection typically checks: venting and draft, the relief valve and its discharge, the expansion tank, the drain pan and its termination, seismic strapping where required, combustion air, elevation in garages, and correct connectors between dissimilar metals. Every one of those exists because of failures that hurt people or houses.
Why it matters beyond compliance. An unpermitted heater install is a disclosure item when you sell and can complicate an insurance claim after a failure. It costs a modest fee and an inspector's visit. If a contractor suggests skipping it, you are being offered risk in exchange for their convenience.
Keep the paperwork: permit, inspection sign-off, invoice, model and serial number, and the warranty registration. Most manufacturer warranties require registration within a window, and the tank warranty is worthless without proof of install date.
Practicalities
How the visit runs
Assessment. Existing unit, fuel, venting, space, and what has been going wrong. If the old tank has failed, this happens fast; if you are replacing proactively, this is the moment to reconsider size and type.
Isolate and drain. Water off, fuel or power off, tank drained. On a heavily sedimented tank draining takes a while, which is one reason a heater that has never been flushed costs more time to remove.
Remove and set. Old unit out, new unit positioned, levelled and, in garages, raised. Access is the variable, an attic or a tight closet takes considerably longer than a garage corner.
Connect. Water with correct connectors, gas with a sediment trap and a shut-off, or electrical to a correctly sized circuit. Vent connected and checked for draft. Expansion tank fitted. Pan plumbed. Relief discharge run.
Fill, purge and fire. Tank filled with a hot tap open to purge air, then lit or energised. Air in the lines is the reason for the sputtering tap afterwards. It clears.
Check and hand over. Temperature set at 120°F, leak check at every joint, draft verified on gas units. You should be shown the shut-off, the relief valve, the drain valve and, on gas, how to relight the pilot.
Two to four hours, typically
A straightforward garage or basement like-for-like replacement is often a half-day. Attic installations, tight closets, fuel changes and units needing new venting or a new circuit take longer. Same-day replacement is usually possible when a tank has failed.
Failed tank, or a ten-year-old one you would rather replace on your own schedule?
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Answered plainly
As a rough guide: one or two people, 30 to 40 gallons; three or four, 40 to 50; five or more, 50 to 80 or a tankless unit. Gas recovers faster than electric, so a 40-gallon gas tank often behaves like a 50-gallon electric. Simultaneous showers and large soaking tubs push the number up more than square footage does.
Usually, when a tank has failed and the replacement is like-for-like on the same fuel. Same-day gets harder if the unit is in an attic with awkward access, if you are changing fuel type or going tankless, or if the existing venting or circuit does not meet current requirements and has to be corrected.
In most Georgia jurisdictions, yes, and the install is inspected. It exists to check venting, the relief valve discharge, the expansion tank, the drain pan, combustion air and garage elevation, all things that have hurt people when done badly. An unpermitted install is also a disclosure item when you sell.
It is a small tank that absorbs the volume increase when water is heated. If your house has a pressure regulator or a check valve, most Georgia houses do, the plumbing is a closed system with nowhere for that expansion to go, and pressure spikes stress the heater, the relief valve and every fixture. It is code-required and frequently missing on older installs.
It is a genuine upgrade, endless hot water and less space used, but switching usually means a larger gas line, new venting and sometimes electrical work, so the install cost is the deciding factor rather than the unit price. If you are replacing on your own schedule rather than in an emergency, it is worth pricing both.
Often yes, in the right location. They use a fraction of the energy of a resistance electric tank, and Georgia’s climate suits them. They need air volume around them, produce cool exhaust air and some noise, and need a condensate drain, so a garage or basement works well and a small interior closet does not.
Replacing a tank, on your terms or theirs?
Sized properly, vented properly, permitted and registered. We will quote it before anything comes out.
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