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Electric Storage Combination Boiler Running Costs Comparison
The figures below are based on a typical 3 bed property with a family of 4 using boiler for hot water and heating and with total annual energy consumption of 15000kwh. The Thermaflow boiler on economy2000 tariff from Scottish Power would cost £1000 to run based on energy prices January 2011.
How much will it cost to run?
(Note : please check with provider for current rates).
This depends on the individual usage, property size, insulation qualities of the property and cost of electricity ie: The tariff which you are using. You can work out an approximate cost by using bills you have had over the past year. Gas & electric bills give the units consumed in Kw/hrs. If you find the total Kw/hrs used for heating & hot water (not lights, tv’s, cooking etc.) over the last 12 months, you can apply this to your new tariff.
Multiply the amount of Kw/hrs by the rate eg: If you consumed 10,000 Kw/hrs you would multiply by whatever your tariff rate is eg: 7.5p/Kwhr. This would amount to 10,000x7.5p = £750.
Some tariffs have two rates for example economy 10 by Scottish & Southern Energy who give 10 reduced rate hours in a 24hr period where your full property is at a reduced rate within these 10 hours.
The hours vary (check with your power supplier for up to date tariffs and their rates).
An example of SSE low rate periods are 12:00am to 5:00am, 1:00pm to 4:00pm and 8:00pm to 10:00pm in England. SSE low rate periods in Scotland are 4:30am to 7:30am, 1:00pm to 4:00pm and 8:30pm to 12:30pm.
Thermal Innovations UK Ltd can provide an off peak time control unit which allows you to make most benefit of the low rate periods. This allows you to charge the unit at reduced cost during these hours and using this energy created in the higher rate periods in turn reducing your fuel bill.
The larger units can store more energy which will last longer in the high rate periods. The initial outlay is more expensive but this payback period for the additional outlay from say using the TH9/210U to using the TH9/330U including off peak control unit would be around 9 months in a two bed property, 6 months in a 3-4 bed property by using the Thermaflow off peak controller in conjunction with the Thermaflow boiler on SSE Economy 10 tariff, you can save between £300 - £500 in Scotland per year on heating & hot water running costs. £400 - £1200 in England, using the same comparison to an electric flow boiler on the same tariff with the same usage.
Tariffs:
Scottish Power Economy 2000
(Note : please check with provider for current rates).
Scottish power Economy 2000 tariff for example provides 18hrs of electricity per day at 6.70p/Kw hr. Interrupting the supply at times of maximum power station demand for 3x2 hour periods per day.
Approximate shut down periods are 8.00am until 10.00am, 4.30pm until 6.30pm and from 12.00am until 2.00am.
Scottish & Southern Energy Economy 10
(Note : please check with provider for current rates).
The E10 Tariff from Scottish & Southern Energy provides 10 low rate hours in a 24hr period. The low rate hours are as follows:
00.00- 5.00, 13.00 – 16.00, 20.00 – 22.00. The full property is low rate within these hours.
Using the Thermaflow to take advantage of low rate hours
(Note : please check with provider for current rates).
To make most benefit of the low rate you would need to have the unit charge up as much as possible in the low rate periods and activate the heating control to come on an hour and a half before the low rate period ends this means you have heated your house up to temperature and recharged the boiler up to maximum temperature before the low rate period ends.
Depending on the individuals lifestyle, you may have to time the off peak control box to run into the higher rate periods as the heat remaining in the boiler will only last about an hour for heating and will have enough heat in the hot water section to provide one or two showers.
On the last low rate period in the evening you would time the off peak controller to switch off an hour before when the heating system runs until as this will deplete the heat from the boiler ready for recharging during the next low rate period.
So put simply we want to deplete the heat from the boiler before the beginning of the low rate period and activate the heating system before the end of the low rate period to allow us to heat the property and recharge the boiler with low rate electricity.
How do I benefit from the Scottish Power Economy 2000 tariff?
(Note : check for up to date tariffs & rates with energy supplier)
Scottish power Economy 2000 tariff for example provides 18hrs of electricity per day at 6.70p/Kw hr. Interrupting the supply at times of maximum power station demand for 3x2 hour periods per day.
Approximate shut down periods are 8.00am until 10.00am, 4.30pm until 6.30pm and from 12.00am until 2.00am.
How do I benefit from the Scottish & Southern Energy Economy 10 Wet Electric tariff?
(Note : check for up to date tariffs & rates with energy supplier)
The E10 Wet electric Tariff from Scottish & Southern Energy provides 10 reduced rate hours in a 24hr period. The reduced rate hours are as follows:
00.00- 5.00, 13.00 – 16.00, 20.00 – 22.00. The full property is reduced rate within these hours.
To make most benefit of the reduced rate you would need to have the unit charge up as much as possible in the reduced rate periods and activate the heating control to come on an hour and a half before the reduced rate period ends this means you have heated your house up to temperature and recharged the boiler up to maximum temperature before the reduced rate period ends.
Depending on the individuals lifestyle, you may have to time the off peak control box to run into the higher rate periods as the heat remaining in the boiler will only last about an hour for heating and will have enough heat in the hot water section to provide one or two showers.
On the last reduced rate period in the evening you would time the off peak controller to switch off at 22.00 if the heating system runs until 23.00 this will deplete the heat from the boiler ready for recharging at midnight.
So put simply we want to deplete the heat from the boiler before the beginning of the reduced rate period and activate the heating system before the end of the reduced rate period to allow us to heat the property and recharge the boiler with reduced rate electricity.
Please use our Enquiry Form if you have any unanswered questions or for any further information you may require.
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