Solar Diverter Calculator

Version 1.1.0
Although best efforts have been taken to ensure accuracy, this utility may contain errors. Therefore, no warranty is provided.

Hot Water Requirement

Here we calculate how many litres of hot water are required per year based on the number of family members living at the property

L

Total hot water requirement per year
litres

Energy Requirement

Here we calculate how much energy is needed to heat all that water to the required temperature

°C

°C

Average cold water temperature
°C

°C

Energy required to heat a year's worth of water
kWh

Investment Required

Here we record the level of any investment required (e.g. solar diverter)

£

£

Total investment required

Solar Consideration

Here we determine how many days in the year when there will not be enough solar excess to heat water

Days in year with sufficient solar generation
days

Gas Requirement

Here we work out the amount and cost of gas required to supply the hot water requirement.

Energy required to heat a year's worth of water
kWh

%

£

Cost of gas to cover one day of water heating
Cost of gas to cover days where there is insufficient solar
Cost of gas to heat a year’s worth of water (without any solar)

Electricity Requirement

Here we work out the amount and cost of electricity required to supply the hot water requirement.

£

Typically, this will be an off-peak rate

Energy required to heat a year's worth of water
kWh
Cost of electricity per day to cover one day of water heating
Cost of electricity to cover days where there is insufficient solar
Cost of grid electricity to heat a year’s worth of water (without any solar)

Lost Solar Export Revenue

Here we determine how much revenue would be achieved if the solar energy used for heating water was simply exported instead.

£

Lost export revenue

Cost Comparisons

Here we compare the costs of using gas or grid electricity, both without and with a solar diverter

Cost of using only gas to heat water
Cost of using only grid electricity to heat water
Cost of using a solar diverter to heat water with gas as backup
Cost of using a solar diverter to heat water with grid electricity as backup
For the payback calculation, the total cost per year using a solar diverter
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