5kWnominal output- DEFRA ExemptSmoke control areas
- EcodesignCleaner-burn standard
- AirwashKeeps the glass clear
ACR · Wood Burning Stoves
ACR T400 ECO Cassette Stove
Designed to bring the warmth and charm of a real fire to a standard 16-inch fireplace opening, the ACR T400 ECO combines classic proportions with contemporary styling. Available with a choice of elegant three or four-sided frames, it creates a seamless finish that complements both traditional and modern interiors.
- Built-in cassette design for a flush, contemporary finish
- DEFRA exempt and approved for burning wood in smoke control areas
- Burns wood and authorised smokeless fuels
ACR RRP for the appliance. Carl confirms the supplied price, and the full fit is quoted after your home survey.
- HETAS registered
- Free home survey
- No-obligation quote
Key features
- Inset cassette installation
- 5kW nominal output
- Multifuel grate for wood or smokeless fuels
- Compact 25cm log length
Specification
T400 ECO
- Height
- 588mm
- Width
- 473mm
- Depth
- 334mm
- Output range
- 5kW nominal (min 2.5kW / max 6.5kW)
- Efficiency
- 74.7% gross, 82.1% net
- Hearth requirement
- Constructional hearth required (hearth temperature above 100 degrees)
- Weight
- 60kg
- Flue diameter
- 125mm
- Smoke exempt
- Yes, DEFRA approved for wood burning in smoke control areas
- Log length
- 25cm
- Energy rating
- A
- Warranty
- 10 years
What's included in the fit
Every Carl Finnell installation is carried out by a HETAS-registered fitter and agreed on your home survey. A typical fit includes:
- The stove, supplied and sized to your room
- Flue or chimney liner, lined chimney or twin-wall flue
- Hearth and chamber work, finished to suit the room
- Register plate and the right cowl or terminal
- Testing, commissioning and first burn
- HETAS certificate, notified to Building Control
Technical documents
Is it right for you?
Who the ACR T400 ECO Cassette Stove suits best
The T400 ECO is the neat answer for a standard 16 inch fireplace opening: a built-in cassette stove that gives you a real wood fire flush with the wall, no freestanding body and no chamber build. It suits period homes that want the original fireplace working again without changing the look of the room, and modern rooms that want a real fire with clean lines.
From the survey
Installation notes for the ACR T400 ECO Cassette Stove
The key difference from our freestanding stoves is the hearth: as a cassette, the T400 needs a constructional hearth because the hearth temperature can exceed 100 degrees. We check what is already behind your opening on the survey. It takes a 125mm flue, fits a standard 16 inch opening, and comes with a choice of three or four sided frames for a flush finish.
An honest steer
How it compares with similar models
Its twin, the T400 ECO BG, is the same stove wearing a contemporary black glass door for a sleeker face. The larger T550 fits an 18 inch opening and takes 40cm logs instead of 25cm. So the decision tree is simple: opening size first, then plain or black glass front. All four cassettes share the DEFRA exemption and 10 year warranty.
Fitting it locally
Fitting the ACR T400 ECO Cassette Stove in Yorkshire homes
The 16 inch opening the T400 is built for is everywhere in the pre-war terraces of Leeds, York and Wakefield, which makes this the cassette we propose when a period fireplace should keep its original proportions but work like a modern stove. DEFRA approved for the smoke control areas those terraces sit in.
Explore
More wood burning stoves
HETAS Registration Number 2087
HETAS registered
Installed with care, certified with confidence
Carl self-certifies every installation and notifies Building Control on your behalf, so the work is signed off properly and your certificate of compliance is issued for your records.
- HETAS-registered installer
- Certificate of compliance issued
- Meets your home insurance
Common questions
ACR T400 ECO Cassette Stove FAQs
Will the ACR T400 fit my fireplace?
It is designed for a standard 16 inch opening, the classic size in pre-war terraces. We measure your opening on the free home survey and confirm the frame option that gives the cleanest finish.
Does the T400 need a special hearth?
Yes, a constructional hearth, because cassette stoves run hotter at the hearth than freestanding stoves on legs. Many period fireplaces already have one; we check yours on the survey before anything is ordered.
What is the difference between the T400 ECO and the T400 ECO BG?
The door. The BG wears a contemporary black glass front, the standard model a classic face. Underneath they are identical: same 5kW output, same efficiency, same DEFRA exemption, same price.
What logs does the T400 take?
Logs up to 25cm, a touch shorter than standard cut, which is worth knowing when you order wood. If you want a cassette that takes 40cm logs, the T550 in the 18 inch opening size does.