for an individual system. More can be added by clicking <b>Add system</b>.</p>
</div>

<p>
To use individual systems you must first put the model into in <a href="#objective-mode">whole-system mode</a> and enable their use (the checkbox is called "Offer other heating systems" on the objective page).
</p>

<p>
In network NPV mode, the model will only use individual system definitions when computing the rate for the <a href="#concept-market-tariff">market tariff</a>.
</p>

<p>
Then you can add some types of i