Comparison

Tankless vs tank water heater: honest comparison for a Dillsburg, PA home.

A side-by-side that doesn’t sell you anything. Read time: about 6 minutes.

The whole story in one table

	Tank, gas (50 gal)	Tankless, gas
Installed cost (Dillsburg avg, 2025)	$1,800–$2,400	$3,800–$6,200
Lifespan we see in the field	9–12 yrs	18–22 yrs
Hot water capacity	50 gal then recovery	Endless within flow rate (typically 5–9 GPM)
Recovery	~40 GPH	Continuous
Energy efficiency (UEF)	0.60–0.68	0.92–0.96
Annual operating cost (gas, avg)	$300–$420	$190–$280
Floor space	~5 sq ft	Wall-mounted (zero floor)
Install complexity	2–3 hrs, like-for-like swap	4–7 hrs, often gas line + venting upgrades
Maintenance burden	Annual flush, anode every 5 yrs	Vinegar descale every 12–18 mo
Comfort during cold-weather inlet temps	Same all year	Slight flow-rate drop in February
If gas goes out	Tank still has hot water for hours	Cold immediately
If power goes out	Atmospheric: still works. Power-vent: doesn’t.	Doesn’t work
Federal tax credit	Not eligible	25C eligible (up to $600 in 2026)

The decision logic we’d use ourselves

Pick a tank if

• You’re replacing a failed unit and want to be back in hot water today.
• Your household runs out of hot water rarely, if ever.
• You don’t want to upgrade gas line or venting.
• You may sell the home in 5–7 years - tankless premium doesn’t fully recover that fast.
• You like the no-think simplicity of a unit that just sits there.

Pick tankless if

• You routinely run out of hot water during back-to-back showers or guests.
• You’re finishing a basement and want the floor space back.
• You’re planning to stay in the house 10+ years.
• You have natural gas and an exterior wall close enough for the venting.
• You don’t mind a yearly descale (or paying us to do it).

The hidden tankless costs no one mentions

Most tankless quotes look attractive until you read the small print. The actual install often requires:

• Gas line upsize. A typical 50-gallon tank uses a 1/2″ gas line; a 199 KBTU tankless usually needs 3/4″ or even 1″. Upsizing the line in a finished basement adds $400–$1,200.
• Stainless concentric venting. Tankless can’t use the old water heater’s metal flue. New PVC or stainless venting through an exterior wall: $250–$600.
• Condensate drain. Condensing tankless units produce mildly acidic condensate that needs a neutralizer and a drain. Add $150–$250.
• Recirculation pump. Optional but highly recommended in larger homes - otherwise you wait longer for hot water at distant fixtures than you did with a tank. Add $400–$700.

Add it all up and a $4,000 tankless quote can become $5,500 once it’s actually installed correctly. Be skeptical of any tankless quote under $3,500 in Central PA - corners are being cut somewhere.

Heat-pump water heaters - the third option

Often overlooked. A heat-pump (hybrid) electric water heater pulls warmth from the air around it and uses 60% less electricity than a standard electric tank. They cost $1,800–$3,000 for the unit, install around $3,400–$4,800 total, last 10–14 years, and qualify for the same federal 25C tax credit. They work best in conditioned basements (which they’ll cool slightly) and are an excellent option for homes without natural gas. We’re installing more of these every year.

Our actual recommendation

For 7 out of 10 Dillsburg homes, the smartest move is a quality 50-gallon tank from a brand we trust (Bradford White, AO Smith), installed with an expansion tank and a service valve, and put on a maintenance schedule. For the 3 out of 10 with the right house and the right horizon, tankless is genuinely better. Either way, we’ll quote both options when we come out, and we won’t push you toward the more expensive one if it’s not clearly the right fit.