Trench heaters with fans FH4-M
High thermal power, allowing use as primary heating devices even in low energy efficiency buildings
Extremely low noise level, suitable for rooms with strict acoustic requirements
Efficient operation with low-temperature heat sources, such as heat pumps and condensing boilers
Low thermal inertia allows heat delivery based on actual demand, thus significantly reducing energy consumption and avoiding overheating of rooms.
EC fans – quiet operation and maximum efficiency, ensuring up to 4× greater convection efficiency
Robust stainless steel casings, designed for pedestrian loads and capable of supporting the weight of several adults
Double-sided aesthetic grilles made of aluminum or oak wood
Designed and manufactured in Lithuania
FH4-M Trench heaters feature high thermal power in compact dimensions and are designed for reliable operation in spaces with stringent acoustic requirements. Due to their extremely low noise level, these convectors are successfully used in thousands of bedrooms, hotel rooms, and living spaces, ensuring comfort without audible background noise.
The units ensure efficient operation in low-temperature heating systems and are adapted for use with heat pumps and condensing boilers.
The low thermal inertia allows for a quick response to temperature changes, making the FH4-H one of the most economical solutions, allowing for precise maintenance of the set room temperature (up to ±0.5 °C).
Integrated EC fans ensure up to 4 times greater convection efficiency while maintaining a very low acoustic level across the entire operating range and even heat distribution in the room.
The convectors come with robust stainless steel casings, ensuring durability and reliable operation even in high-traffic areas. The design is adapted for pedestrian loads – the convector can be safely walked on and withstands the weight of several adults.
For architectural integration, double-sided aesthetic grilles made of aluminum or oak are used, allowing the solution to be matched with the flooring and interior concept.
- Stainless steel casing
- Heat exchanger holder
- Cover for hydraulic connections
- Casing reinforcement elements
- Anodized aluminum frame; color matches the grille color
- Copper-aluminum heat exchanger
- Air vent
- Air deflection element
- Fan with EC motor
- Air filter
- Control unit (ordered separately)
- Protective-decorative grilles (ordered separately)
- Heat exchanger protection-fixing elements
- Adjustable height legs
- Sound-insulating leg pads
- Casing floor mounting elements
- Sound-insulating gaskets
- Pipe sealing-protection elements
- Cable sealing-protection elements
- Blanks for unused openings
- Fan vibration isolation pads
Mounting hardware
Installation instructions
5-layer, 2-part corrugated cardboard box, also used as protective covering for the device during construction work
FH4-M

ROLL-UP ALUMINUM GRILLES GR
SILVER (ALS)
BROWN (AL10)
BLACK (AL50)
LINEAR ALUMINUM GRILLES GR-L
SILVER (ALS)
BROWN (AL10)
BLACK (AL50)
ROLL-UP WOODEN GRILLES GR
OAK (OAK)
Actuator for Thermostatic Valve A24NC
For opening/closing the thermostatic valve. Controlled by room thermostat TW24
Operating voltage - 24V DC
E power - 2.5W
Protection class - IP54
Connection thread - M30 x 1.5mm
Casing material PC/ABS
Thermostatic Valve (Straight) TVS15
For regulating the energy carrier flow. Controlled by actuator A24NC
Operating temperature -10℃ - 120℃
Thread 1/2″
Pressure class - PN10
Kvs - 2.00
Body - nickel-plated bronze
Return Flow Limiter (Straight) LS15
For opening, closing, and setting the maximum flow of the energy carrier
Operating temperature -10℃ - 120℃
Thread 1/2″
Pressure class - PN10
Kvs - 2.00
Body - nickel-plated bronze
Return Flow Limiter (Angled) LA15
For opening, closing, and setting the maximum flow of the energy carrier
Operating temperature -10℃ - 120℃
Thread 1/2″
Pressure class - PN10
Kvs - 2.00
Body - nickel-plated bronze
Control unit CB20
For connecting and powering fans, A24NC actuators, and TW24 room thermostat
24V DC power supply
Power - 20W
Current - 0.84A
E connection terminals
Stainless steel casing
CONVECTOR ORDER CODE
| MODEL | LENGTH, cm | WIDTH, cm | HEIGHT, cm | EXAMPLE |
| FH4-M | 214 | 17.7 | 8.6 | FH4-M 214-17-86 |
GRILLE ORDER CODE
| MODEL | LENGTH, cm | WIDTH, cm | MATERIAL | EXAMPLE |
| GR | 200 | 20 | ALS | GR 200-20-ALS |
| GR-L | 200 | 20 | ALS | GR-L 200-20-ALS |
| GR – roll-up grilles | ALS – aluminum grilles, silver color | |
| GR-L – linear grilles | AL10 – aluminum grilles, brown color | |
| AL50 – aluminum grilles, black color | ||
| OAK – oak grilles | ||
ACCESSORY ORDER CODES
| MODEL | ORDERCODE |
| Straight return flow limiter | LS15 |
| Angled return flow limiter | LA15 |
| Straight thermostatic valve | TVS15 |
| Axial thermostatic valve | TVA15 |
| Elektroterminė pavara 24V | A24NC |
| Control unit | CB20 |