text-concept-constraints">
<p>
THERMOS is an optimising model which means it makes some decisions.
</p>

<p>
The main decision is whether to put something in a heat network.
</p>

<p>
The constraint status of an item affects whether the optimiser can or must use it in a network.
</p>

<ul class="org-ul">
<li>If the status is forbidden, the item is ignored</li>
<li>If the status is optional, the item will be included in a network if that is an improvement on any alternative</li>
<li>If the status is required