exofura      Maintenance South East London

Cost and CO2 emissions of using electricity or gas - Calculator. Feel free to fill in parameters such as how many people live in your home, how much water you save or waste relative to an average user, prices of energies you pay, etc.

HW cost1
                 
Cold water temperature
⁰C
Hot water temperature
⁰C
Delta
⁰C
Water specific heat KJ/kg.K Water density
kg/dm3
Standing charge of gas meter
p/Day
Price of natural gas
p/kWh
Standing charge of el. meter
p/Day
Price of electricity
p/kWh
 
Number of persons living in a property
N
Savings / wastage coefficient
%
Q - daily consumption of HW in a property (1)
L
Energy needed to heat up water
KJ
Energy needed  to heat up water
kWh
Typical combi boiler - HW mode (2)
£..kg
HW storage tank and old system boiler (3)
£..kg
Instantanious water heater / el. shower (4)
£..kg
Typical HW storage tank (5)
£..kg
consumption, cost / day
consumption, cost / year
CO2 produced /year Kg (6)
(1) Q = 40 + 28 N, Measurement of Domestic Hot Water Consumption in Dwellings, energy saving trust
 https://goo.gl/mv6A8o
(2) efficiency 85%, 15% losses in the pipework
(3) efficiency 55%, 20% losses in the pipework
(4) efficiency 100%, 0% losses in the pipework
(5) efficiency 100%, 20% losses in the pipework
(6) natural gas - 203g/kWh, el. - 527g/kWh, at the point of consuption, DEFRA

 

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