HTH Fireplace Grate Firedogs Andiron Blowers

The Hasty Heat "Hard Times Heater" (HTH) Series
Welcome to the home of the legendary Hard Times Heater (HTH)—the original, heavy-duty tubular fireplace grate heater engineered to turn cold, inefficient hearths into powerful home furnaces. If you are tired of watching 90% of your wood heat escape straight up the chimney, the Hasty Heat HTH series is your solution. Built by hand from industrial-grade structural steel, our burnout-resistant designs capture roaring fire temperatures and blow high-velocity warmth directly into your living space.
Whether you are preparing for emergency winter power outages, setting up an off-grid homestead, or simply trying to slash your electricity and heating bills, there is an HTH built for your hearth.
📐 Explore the Hard Times Evolution:
  • The HTH is a Compact Modular System: Designed with a nimble, space-saving, modular design. That can be used in multiples and rearranged like legos (right, left, or vertical) to suit nearly every customers individual needs. Engineered to flat-pack and save you massive shipping costs, the HTH uses a streamlined tube profile that heats up faster than traditional iron grates. It features a heat-shielded USB blower that runs for hours off a simple phone battery bank, and its modular design allows you to bolt multiple units together using simple TEK screws to fit any custom hearth layout. When stood up vertically, the HTH utilizes solid-state thermal physics to naturally draft-convect—pushing significant hot air into your room safely if the grid goes down.
  • The HTH5 High-Output Universal System: The big brother. The HTH5 is identical in form an function to the HTH but with slightly wider and thicker tubing and a larger fan with 1/3 more airflow. 
🛠️ Built for Survival, Seasoned Like Cast Iron
Every heater in the Hasty Heat HTH lineup features our continuous-cooling airflow design. Because the blower draws heat off the metal, the tubes never reach a glowing red-hot state, preventing oxidation and thinning over decades of heavy burning. Just treat your HTH like a classic cast-iron pan—rub it down with cooking oil when cold, and watch it develop a beautiful, natural gun-blue patina with every fire you build.
Stop losing your wood. Upgrade your hearth game and choose the ultimate grid-independent heater today.

Built to last for decades, and the heat it saves adds up every winter.

Same fire, same wood: stand a few steel loops in your fireplace and more of that heat is blown into your home instead of going up the flue. Here's the shop math.

What one HTH does

  • Heat recovered: about 5,200 BTU/hr (1.5 kW) typical; range 1,700–9,100 BTU/hr on a typical 3-log fire (20HTH20D)
  • Efficiency: nearly doubles your fireplace's heat output with just one HTH, giving you significantly more heat (about 8% to about 15% efficient), and hits about 28% efficient with four HTHs, about 3½ times the heat of the open fire alone
  • Wood: no change; you get more heat from the same fire
  • Power outage: the low-power USB fan is tested to run for 10 hours on a common cellphone battery bank, or even longer on a 12V car battery, so the heat keeps moving when the grid is down
  • Variable speed: optional add-on

What it's worth

  • Vs. electric heat at 17.65¢/kWh (US winter peak), 5 hours a night: about $40 a month (range $10–$85)
  • For current pricing, see the HTH product page
  • Massachusetts winter rates: about $71 a month

Run more than one

  • Stand them upright in a fan, about 5" apart center-to-center at the back and 7" at the front
  • The log bars can overlap between units
  • Spread the wood and/or coal bed across the full rear width so every unit gets fire
Units Approx. BTU/hr (typical) Front width Back width
1 about 5,200 — fits even a tiny 14" back wall
2 about 9,800 — fits even a tiny 14" back wall
3 about 13,400 — fits even a tiny 14" back wall
4 about 15,200 about 25" about 20"
5 more with a wide fire about 32" about 24"

Check your fit

  • Fireplaces are trapezoids, wider at the front than the back
  • Sticking out a few inches is fine as long as there are no doors that need to be shut. If you use a free-standing spark screen on an open fireplace, you're set
  • For a fireplace with doors, choose a depth that fits behind your shut doors
  • Measure your own fireplace first: fireplace dimensions guide

Your results vary with fire size, wood, draft, spacing, fan speed, home and local winter energy prices; figures are estimates, not test results.