Adventure
Firnace
A furnace-shaped plant that runs continuously hot, dealing thermal damage to any zombie that steps adjacent to it and periodically venting a full-row fire blast that chars all zombies in the lane.
Plant Stats
Sun Cost
150 Sun
Damage
20 (contact) / 70 (vent blast)
Attack Interval
Contact: Continuous / Vent: 6 Seconds
Range
Adjacent (contact) / Full Lane (vent)
Target
Ground Zombies
Toughness
1000
Recharge
8 Seconds
Best Combo Plants
Details
Passively deals 20 thermal damage per second to any zombie within adjacent tiles. Every 6 seconds, vents a full-lane fire blast dealing 70 damage to all zombies in the same row and applying a 2-second Burn status. Both effects can stack with other fire-type plant damage.
Firnace combines constant adjacent heat damage with a periodic full-lane fire vent, giving it both a passive deterrent and a powerful periodic sweeper. Place it in the middle column so its adjacent heat affects the front and middle tiles simultaneously while the vent blast travels the full lane. The 70-damage vent fires every 6 seconds and chars all zombies in the lane for an additional 2 seconds of burn damage. In Survival Mode, Firnace anchors the midfield by dissuading zombies from clustering near it and periodically clearing the entire lane. Pair with Coldsnap Bean in front of it to slow zombies into its heat zone. In Endless Mode, alternate Firnace and Endoflame across lanes for consistent fire coverage across the grid. Its 1000 toughness is good for a mid-range attacker, allowing it to survive contact with weaker zombies.
Firnace excels against slow zombies that cluster near it and absorb extended contact heat damage. Gargantuar and Buckethead variants that move slowly into the heat zone take heavy sustained damage before reaching Firnace itself. Dense lane formations that line up for the vent blast are decimated by the 70-damage sweep.
✓ Strengths
Dual damage mode: passive heat plus periodic vent for versatile output
70-damage vent blast is powerful at 6-second intervals
Burn status adds 2 seconds of damage after each vent
1000 toughness is solid for a mid-field plant
Adjacent heat passively damages any zombie that lingers near it
✗ Weaknesses
Cannot target aerial or underground zombies
Fire-immune zombies negate all damage from both modes
Fast zombies minimize contact time in the heat zone
6-second vent interval can leave gaps in lane coverage
Requires mid-field placement for best effect limiting row flexibility
1
Place in column 3 or 4 for optimal adjacent heat range and full-lane vent coverage
2
Pair with Coldsnap Bean to slow zombies into the heat zone for extended contact damage
3
In Endless Mode, alternate with Endoflame across lanes for consistent fire grid coverage
4
Use Kernel-pult butter stun to lock zombies in front of Firnace for the full vent blast
5
Back it with a Torchwood to stack fire procs on both the heat and vent damage for maximum burn output
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