People in House:
Age of Tank Heater (years):
Price per Therm ($):


Annual Tankless Gas Savings

Hot Water Usage

Hot water per person: 30 gal / day
Gallons per day: 600 gal / day
lbs water per day: 4998 lbs
Degree rise: 65 deg F
Btu per day: 324,870 btu

Gas Consumption

Tank Heater
Efficiency: 56%
Gas per day: 5.8 therms
Tankless Heater
Efficiency: 92%
Gas per day: 3.53 therms

Water Heater Replacement Savings

Average life of tank water heater: 10 years
 
Average replacement cost: $800
 
Annual tank replacement cost: $80 per year

Yearly Savings

Price per therm: $20.00
Annual gas savings: $16571
Annual tankless maintainence cost: - $20
Total annual savings: $16551.4

Tankless Revenue Stream

Equipment Cost Escalator: 5%
Fuel Escalator: 8%
Initial Cost after $300 Fed. Tax Credit Rebate: $2,700
Year Gas Savings Equipment Savings Yearly Savings Total Savings
Payback → 1 $16551 $0 $16551 $16551
2 $17876 $0 $17876 $34427
3 $19306 $882 $20188 $54614
4 $20850 $0 $20850 $75464
5 $22518 $0 $22518 $97982
6 $24319 $0 $24319 $122302
7 $26265 $0 $26265 $148567
8 $28366 $0 $28366 $176933
9 $30635 $0 $30635 $207569
10 $33086 $0 $33086 $240655
11 $35733 $0 $35733 $276388
12 $38592 $0 $38592 $314980
13 $41679 $1437 $43116 $358096
14 $45014 $0 $45014 $403109
15 $48615 $0 $48615 $451724
16 $52504 $0 $52504 $504228
17 $56704 $0 $56704 $560932
18 $61240 $0 $61240 $622173
19 $66140 $0 $66140 $688312
20 $71431 $0 $71431 $759743
21 $77145 $0 $77145 $836888
22 $83317 $0 $83317 $920205
23 $89982 $2340 $92323 $1012528
24 $97181 $0 $97181 $1109709
25 $104955 $0 $104955 $1214664
26 $113352 $0 $113352 $1328016
27 $122420 $0 $122420 $1450436
28 $132214 $0 $132214 $1582650
29 $142791 $0 $142791 $1725440
30 $154214 $0 $154214 $1879654
Lifetime savings: $4659 $1879654 $3759309
Lifetime ROI: 4638% per year