Installation manual

www.dimplex.de 201
Investment and Operating Costs 9.1
9 Investment and Operating Costs
The overall costs of a heating system consist of three parts:
 Investments
 Energy costs
 Incidental costs
Investments have to be made at the start of construction work for
installation of the heating system. This should be broken down
into annual instalments for a profitability analysis. Energy costs
and incidental costs normally accrue annually. To be able to
compare the different types of heating systems, these three
types of costs must be added together accordingly. A
comparison is normally made of the annual costs or “heat
production costs”. The heat production costs represent the costs
of one heat unit (e.g. kWH).
k
heat
= k
investment
+ k
energy costs
+ k
incidental costs
A simplified costing can be made by dividing the investments by
the number of operating years to calculate the annual
instalments. To carry out a full costing (including interest), the
investments are broken down into annual instalments on the
basis of the interest rate and the operating period. The most
frequently used calculation method is the annuity method which
assumes the heat demand to remain constant. The annual
investment instalments are calculated using this method as
follows:
whereby:
9.1 Incidental Costs
Frequently, only the investment costs and the energy costs are
used for a cost comparison of heating systems. However, other
factors such as the power supply connection or maintenance
contracts can also considerably increase the annual incidental
costs depending on the type of heating system implemented.
Heat pump systems can be compiled on the following pages in
order to calculate the required investment costs.
Different types of heat pump systems for monovalent, mono
energy and bivalent operation can be compared with a oil heating
system to calculate the energy costs (in Chap. 9.2 on p. 202).
The annual energy costs of a gas heating system can be
compared in a similar manner, although the costs for this type of
system are normally higher than for oil heating systems.
NOTE
Visit www.dimplex.de to use our operating cost calculator to compare
different types of heat generators.
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Investment
Annual proportion of investment costs
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Investment
Investment at start of construction work
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Comparison of costs Oil heating Heat Pump
Investment ÷ operating period €/a
Incidental costs (Chap. 9.1 on p. 201)€/a
Energy costs €/a
Total costs
Oil heating Heat Pump
Incidental costs
Values based
on past
experience
Your
figures
Values based
on past
experience
Your
figures
Transfer price of heat pump meter 55.00-- €
Power for circulating pump / burner 130.00-- € 30.00-- €
Chimney sweep incl. emissions measurement 55.00-- €
Maintenance contract 125.00-- €
Repairs 1.25 % of purchasing costs 50.00-- € 65.00-- €
Insurance for internal oil tank 80.00-- €
Interest on tank reserve 50.00-- €
Tank cleaning (necessary provision) 40.00-- €
Total incidental costs
530.00-- € 150.00-- €