Which makes more sense?

Takagi (Flash) TK-1 Tankless Water Heater

Or A

The Storage Tank Water Heater ?

Features

T-K1

50 gallon gas
storage tank

First Hour Rating

216 gal/hour

74 gal/hour

BTU Input

37,000-165,000

40,000

Tank size

unnecessary

50 gallons

Thermal Efficiency

Max. NG 82.3%

Max. LPG 0.84%

76%

Energy Factor—

Natural Gas

0.81

0.54

LP Gas

0.84

0.53

Size in Cubic Ft.

2.2

30

Dimensions

H: 24.5"
W: 16.5"
D: 8.3"

H: 57"
D: 19.75"

Modulating Gas Valve

Yes

No

Computer Controls

Yes

No

Electronic Ignition

Yes

No

Built in Power Vent

Yes

Optional

Wall Hanging

Yes (optional)

No

Life Expectancy

23-30 years

2-10 years