Product Description
External wood heat in three output classes · Purpose-built hot-tub heating
TimberIN Nordic External™ Wood-Fired Hot Tub Heater: preserve bathing space and service the fire from outside
A separate stove gives the bathing area back to bathers
External placement is particularly useful when an internal heater would compromise seating or when the fire needs to be tended without entering the tub. Cooler water travels to the lower connection and heated water returns through the upper route in the approved arrangement. For naturally circulating systems, pipe diameter, length, rise and absence of air locks are critical. The stove also creates an equipment zone outside the tub that must remain clear for loading, ash removal and future inspection; hiding it tightly behind decorative cladding can undermine both safety and serviceability.
Three outputs for three different thermal loads
Nordic External is a freestanding wood-fired hot-tub heater family. Moving from 22 to 28 or 40 kW is not simply paying for faster heat: output must remain compatible with water volume, connection area, natural or pumped circulation, fuel rate and the ability to control temperature. External placement keeps the tub interior free and makes the firebox accessible, while adding a second footprint, two water connections and a chimney zone beside the tub.
| Selectable nominal outputs | 22 kW, 28 kW or 40 kW |
|---|---|
| Layout | Freestanding external wood-fired heater |
| Tub compatibility | Must be confirmed from volume, shell material, port sizes, levels and circulation design |
| Heat-up time | Not universal; calculate from water load and verify in commissioning |
| Required site space | Heater body, firebox approach, connections, chimney and safe clearances |
| Service advantage | Accessible without entering the bathing shell |
| Installation effect | Extra footprint, exposed connections and more heat loss than a fully integrated route |
How to decide between 22, 28 and 40 kW
The 22 kW model belongs with smaller or well-insulated water volumes where a calm firing rate is acceptable. The 28 kW version is the middle route for common family tubs. The 40 kW model may suit larger volumes or demanding recovery times, but only when the heat exchanger, water flow and chimney are designed for it. Oversizing can make temperature rise harder to control and increases fuel and clearance demands; undersizing extends the session. Supply the manufacturer with exact litres, port positions and intended winter use before choosing.
| Decision | Choices currently selectable |
|---|---|
| Power | 22KW · 28KW · 40KW |
Convert kilowatts into a planning range, not a promise
Raising 2,000 litres by 30°C requires roughly 70 kWh before heat loss. At theoretical full transfer that is about 3.2 hours at 22 kW, 2.5 hours at 28 kW or 1.75 hours at 40 kW; a real wood installation takes longer because output varies and heat escapes. These figures are engineering context only. Dry fuel, cover, wind, pipe length, water flow and safe firing practice decide actual performance, which should be recorded during controlled commissioning.
Select output only after circulation and heat loss are understood
Match 22, 28 or 40 kW to the supplier-approved tub volume, material and connection layout. Establish the shortest practical pipe route, support the pipework and avoid reductions or valves that could restrict flow unless the engineered design explicitly requires them. Plan a compliant chimney, heat shielding and clearance from timber, covers and planting. Heat-up time will still vary with starting water temperature, weather, fuel moisture, wind and cover quality, so compare the whole thermal system rather than choosing the largest rating on the assumption that it will solve every site issue.
Before production: TimberIN products are individually made, so published measurements are approximate. Confirm the selected live variation, final dimensions, included equipment, service requirements, delivery method and any critical tolerances in the accepted written quotation. Photographs may show optional equipment.
Questions about TimberIN Nordic External™ Wood-Fired Hot Tub Heater
What power choices are shown for TimberIN Nordic External™ Wood-Fired Hot Tub Heater?
Power choices currently shown are 22KW; 28KW; 40KW. Availability and valid combinations are controlled by the live configurator and confirmed in the final written order.
Does the displayed price include every option for TimberIN Nordic External™ Wood-Fired Hot Tub Heater?
Not necessarily. The displayed amount follows the current base or selected configuration. Size, material, heater, equipment, delivery and installation choices can change the total; the basket, quotation or written order is the final commercial record.
What should be confirmed before delivery of TimberIN Nordic External™ Wood-Fired Hot Tub Heater?
Confirm that the heater is compatible with the tub material, real water volume, connection layout and required circulation. Plan firebox access, guarding, chimney route and clearances exactly as required by the heater and tub instructions. Do not treat nominal kW as a guaranteed heat-up time; starting water temperature, cover, weather, fuel and heat loss all matter. Final dimensions, included equipment and site responsibilities should be confirmed before production or dispatch.
