PREFERENTIAL TARIFF

Running Cost Comparison

Examples of Tariffs Available for electric wet heating systems
This example is based on the requirements of a typical family home where hot water is required to heat seven radiators and supply hot water to taps. During the winter, which we will assume covers half the year (180 days), heating and hot water is required for 8 hours each day. During the summer (180 days) water heating is only required for 1 hour each day.

The heating is on as follows:
Winter: 7-11am
Winter: 5-9pm
Summer: 5-6pm

THERMAflow Boiler	Flow type boiler using economy 10 tariff
The Thermaflow boiler range operate on the Scottish Power Economy 2000 tariff which will give 18 hours of constant electricity supply at half price. This example is based on a 210 litre Thermaflow with an output of 9kW The shut down periods are: 00:00 - 02:00 08:00 - 10:00 16:30 - 18:30 If the boiler is used at maximum, (heating and hot water), for 180 days a year - consuming 9kW/hr, and used for hot water over 180 days - consuming 3kW/hr, the total annual consumption is 13500kW/hrs. This is Off-Peak electricity and the rate at 01/01/2007 is 5.5p per kW/hr. (cost = electricity used x rate) Peak Rate Electricity used: 0kW/hrs Off-Peak Electricity used: 13500kW/hrs Cost of electricity used: £663.00	Flow' or 'Direct Acting' boilers can only operate on meters that provide 10 hours of Off-Peak electricity per day provided by Scottish Hydro Electric. This example is based on a 9kW boiler and a 3kW hot water element. Off-Peak times are: 04:30 - 07:30 13:30 - 16:30 20:30 - 00:30 If the boiler is used at maximum, (heating and hot water), for 180 days a year - consuming 9kW/hr, and used for hot water over 180 days - consuming 3kW/hr, the total annual consumption is 13500kW/hrs. This will have to be based on 7 hours of On-Peak and 1 hour Off-Peak per day in winter and 1 hour at peak rate per day in summer. The On-Peak rate at 01/01/2007 is 9.1p per kW/hr. (cost = electricity used x rate) Peak Rate Electricity used: 11880kW/hrs Off-Peak Electricity used: 1620kW/hrs Cost of electricity used: £1170.00

THERMAflow Boiler

Flow type boiler using economy 10 tariff

The Thermaflow boiler range operate on the Scottish Power Economy 2000 tariff which will give 18 hours of constant electricity supply at half price.

This example is based on a 210 litre Thermaflow with an output of 9kW

The shut down periods are:
00:00 - 02:00
08:00 - 10:00
16:30 - 18:30

If the boiler is used at maximum, (heating and hot water), for 180 days a year - consuming 9kW/hr, and used for hot water over 180 days - consuming 3kW/hr, the total annual consumption is 13500kW/hrs.

This is Off-Peak electricity and the rate at 01/01/2007 is 5.5p per kW/hr.

(cost = electricity used x rate)
Peak Rate Electricity used: 0kW/hrs
Off-Peak Electricity used: 13500kW/hrs
Cost of electricity used: £663.00

Flow' or 'Direct Acting' boilers can only operate on meters that provide 10 hours of Off-Peak electricity per day provided by Scottish Hydro Electric.

This example is based on a 9kW boiler and a 3kW hot water element.

Off-Peak times are:
04:30 - 07:30
13:30 - 16:30
20:30 - 00:30

If the boiler is used at maximum, (heating and hot water), for 180 days a year - consuming 9kW/hr, and used for hot water over 180 days - consuming 3kW/hr, the total annual consumption is 13500kW/hrs.

This will have to be based on 7 hours of On-Peak and 1 hour Off-Peak per day in winter and 1 hour at peak rate per day in summer. The On-Peak rate at 01/01/2007 is 9.1p per kW/hr.

(cost = electricity used x rate)
Peak Rate Electricity used: 11880kW/hrs
Off-Peak Electricity used: 1620kW/hrs
Cost of electricity used: £1170.00

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