⚠️ SPOILERS BELOW
This section documents the current optimal build for Waste Heat Recovery (v0.2.19), found through testing. If you'd rather work it out yourself, stop scrolling now — this section may be removed in future balance passes.
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Still scrolling? Spoilers are further below — last chance to turn back.
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Getting close now — still time to stop.
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Optimal build: Waste Heat Exchangers to Waste Heat Boilers at a 1:1 ratio. Exchanger heat gain is currently very strong on its own, and it stacks multiplicatively with idle-miner cooldown below — this combination is what makes the setup this efficient.
Coverage is crucial: Waste Heat Exchangers can only absorb heat from miners within their 15-tile detection radius. They should be placed in locations that overlap with the coverage of operating miners—proportion alone is insufficient if coverage is empty. Overlapping coverage does not result in wasted heat—each eligible exchanger receives an equal share of the total heat output, regardless of overlap. However, overlap does not increase the total heat output: the heat dissipation of an operating miner covered by multiple exchangers is only counted once. To maximize heat dissipation, exchangers need to cover different, non-overlapping operating miners.
Cooldown formula: reduction = 0.839 × min(1, heat / 140000) × min(1, idle_ratio × 3).
The second term caps out once idle_ratio reaches 33.4% — pushing idle miners past one-third of your total miner count gives no further cooldown benefit.