A modern Viessmann heating boiler, however, automatically adjust its operating temperature to the outdoor temperature - and even turns off entirely when no heat is required - saving both energy and money.
Old heating system: Fuel Efficiency (oil): 68%, Annual Fuel Consumption: 1268 USG / 4800 liters
New heating system: Fuel Efficiency (oil): 87%, Annual Fuel Consumption: 925 USG / 3500 liters
Savings: 343 USG, which equals $1,170 a year (at $3.41/USG of oil) 1300 liters, which equals $1,170 a year (at $0.90/ltr of oil)
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