ACR Announce: Tempus With Extra Long Burn Times

A new-generation wood stove focused on steady heat, restrained styling, and real-world usability. The ACR Tempus pairs long-burn combustion technology with clean, contemporary design.

October 30, 2025
By Reece Toscani
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New Stoves

New Stove Released: ACR Tempus

ACR has officially introduced the Tempus, a new contemporary wood-burning stove designed to do something many modern stoves promise — but few genuinely deliver: longer, steadier burn times with minimal user input.

Available in 5 kW and 7 kW nominal outputs, the ACR Tempus is aimed squarely at today’s homes, including properties in Smoke Control Areas, and arrives as a clear signal that ACR is leaning harder into intelligent combustion rather than cosmetic updates.

This isn’t a facelift or a minor refresh. The Tempus represents a shift in how ACR is approaching efficiency, control, and real-world usability.

Why the Tempus Exists

The Tempus lands at a moment when the wood-burning conversation has matured.

Efficiency figures alone no longer cut it. Homeowners are looking for:

Fewer refuelling cycles
More predictable heat output
Cleaner burning in everyday use — not just on test benches

Rather than chasing headline numbers, the Tempus focuses on controlled, sustained combustion, allowing the stove to work consistently in the background instead of demanding constant attention.

The result is a stove designed to heat the room you’re actually using, rather than over-firing and throttling back in cycles.

Technology That Actually Matters

At the core of the Tempus is an automatic thermostatic air control system. There are no electronics, no apps, and no external power requirements.

Instead, the stove continuously adjusts airflow to maintain an efficient burn rate — helping it:

Burn fuel more completely
Reduce smoke and CO emissions
Extend usable burn time from a single load of wood

ACR describes this as “burning the smoke, not the fuel”. Stripped of marketing language, what’s happening here is effective secondary combustion combined with controlled airflow, allowing the stove to cruise steadily rather than constantly sprint.

It’s a smart solution that doesn’t rely on complexity.

🔥 New Stoves, Properly Explained

We track new stove releases as they happen — focusing on what’s genuinely new, what’s changed, and what actually matters in real homes.

If you want to explore current models, specifications, and availability beyond the announcement stage, you’ll find a growing library of modern wood-burning stoves over at Redefining Woodburners.

👉 Browse modern wood stoves, compare designs, and understand what’s right for your home.

Two Burn Modes, Real Flexibility

One of the Tempus’ standout features is its dual operating modes, giving it a level of adaptability that’s still relatively rare in this segment.

Continuous Burn Mode – Designed for long, steady heat output.

Up to 10 hours from a single load
Efficiency up to 85.4 %
Suited to overnight or all-day heating

Intermittent Burn Mode – Optimised for Smoke Control Areas.

Efficiency around 79.7 %
Lower CO emissions
DEFRA-approved for wood burning in smoke-controlled zones

This flexibility makes the Tempus suitable for a far wider range of homes and usage patterns than many fixed-behaviour stoves.

Design, Build & Presence

Visually, the Tempus is restrained — and deliberately so.

Clean vertical lines, softened edges, and a balanced stance give it a calm, architectural feel rather than an industrial one. The firebox sits neatly within a tall, slim body, with the flame framed by a generous glass window that prioritises view over gimmicks.

A discreet lower log store adds warmth and practicality without breaking the silhouette, grounding the stove visually while keeping everything feeling intentional.

In real interiors, the Tempus reads as modern but not cold — equally at home in minimalist spaces, family living rooms, or open-plan layouts where the stove needs to blend rather than dominate.

Importantly, it’s the kind of stove that still looks right when it isn’t lit — something that matters far more than most brochures admit.

Key Specs & Who It’s For

Headline Specifications:

Nominal output: 5 kW or 7 kW
Efficiency: 79.7 % – 85.4 %
Flue diameter: 150 mm
Weight: 136 kg
Maximum log length: 340 mm
Smoke Control: Yes (Intermittent mode)

Who should be paying attention?

Homeowners wanting longer burn times with less intervention
Properties in Smoke Control Areas that still want flexibility
Buyers comparing modern stoves against heat-pump-led solutions
Anyone frustrated by manual-only air control systems

The ACR Tempus doesn’t try to be everything. Instead, it focuses on doing a few important things very well: controlled combustion, long-burn comfort, and design that fits modern living spaces without shouting about it.

If long-burn capability and real-world efficiency are moving up your priority list, the Tempus is a stove worth watching — and one that signals where modern wood-burner design is heading next. Let us know in the comments below if you like the sound of the ACR Tempus woodburner and if you would like to see a stove spotlight on this model in the future.

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Reece Toscani

Reece has over two decades in the fireplace and stove world — testing, reviewing, and occasionally getting covered in soot, all in the name of wood-fired home heating. He cuts through the nonsense, busts the myths, and shares straight-talking advice to help you enjoy your stove without the confusion. From Fireplace Products to Redefining Woodburners, if it burns wood, he’s probably tested it, fixed it, or argued about it. Now, through Woodburner Insights, he shares that experience with the world — both here and on YouTube.