Plastic hot tub with external heater
The Welltub plastic hot tub with external heater are the most user-friendly friendly hot tubs on the market.
Hot Tubs with an outdoor heater
Several variants of outdoor stoves.
A plastic Hot tub with a heater outside the bath is also called a plastic hot tub with external heater, or Hot tub with external heater. By means of a supply hose in the bath, water flows – as soon as you start filling the bath – automatically to the heater. The stove has a double wall and therefore contains a lot of water around the fire. This creates a large surface area where heat transfer takes place. As soon as the fire heats up the water, the hot water in the double walls will rise, just like hot air hot water rises and goes up. At the top of the stove the water will find an exit to the bath and hot water will naturally find its way back to the bath. Once in the bath, the hot water will continue to rise and manifest itself on the surface. Because of this movement the heater will slowly empty, and will automatically attract cold water through the lower connection between the bath and the heater. The Hot Tub with heater outside is thus heated in a completely natural way, no pump is needed.
How far should the heater of the Hot Tub be ?
In the case of a plastic hot tub with an external heater, we are often asked at what distance the Hot Tub heater can be placed. The main rule here is that the stove should be as close to the Hot tub as possible, i.e. a maximum distance of 15 to 20 cm. By keeping the distance as short as possible, a good circulation is possible and the stove will not overheat. If you keep a longer distance, too slow a flow of air could overheat the stove, with all its consequences.
How hot will the external heater be which is outside the hot tub ?
The purpose of the outdoor heater is to heat up the water as quickly as possible so that you do not have to wait long to enjoy the Hot Tub. However, the purpose of this stove is not to warm up the environment. As the stove is always double-walled, hot water will capture the heat and circulate to the tub itself. A frequently heard question is whether the stove is hot on the outside. However, this is not the case; it is often best to compare the stove with a central heating system in the house. It is warm, but you will not be able to burn your hands on it.
Advantages of the plastic hot tub with external heater
Although the Hot Tub with internal heater has a unique look and feel and can be very cozy and atmospheric because the heater is in the bath, the plastic hot tub with external heater also has advantages such as :
The inner tub itself is quicker to clean, no stove and rack that attracts dirt
The external stove is a little easier to light
More space if you compare with the same diameter tub
Even more safety for children.
In general, the Hot tub with internal heater is perceived as something more atmospheric or authentic. The tub with external heater is more practical in ease of use.
Prices models external heater ?
We generally supply external outdoor heaters with an aluminium interior for the fastest heat transfer. However, stainless steel outdoor heaters are also available on request and have a longer heating time (not our preference). Each outdoor hot tub heater has a double wall around the fireplace. As soon as you fill the hottub with water, the external heater will also fill the double wall with cold water. As soon as the hottub is filled you start firing and heat transfer takes place through the aluminium inside of the stove. The water in the between wall will become warmer and will rise and circulate back to your hottub through the top tube.
3 variants outdoor stoves, the extended, the extended + 45 kW, the extended ++ 55 kW
Variants external heaters
We supply 3 variants of external heaters as standard:
Average heating times depending on the model, season and method of heating between 1.75 – 2.0 hours (calculated from 15 degrees to 38 degrees).
Built-in hot tub with external stove (and pump)
For many years we have been supplying recessed plastic hot tubs with internal heaters because there was always a natural circulation. Since 2018, however, we have carefully started the production of built-in plastic hot tubs with external heaters, equipped with a slow circulation pump and alarm protection. The alarm protection system will alert the user that the stove will have to be extinguished as soon as the circulation is lost. With the advent of this variant of built-in hot tubs, we see new possibilities for those who want to integrate their sitting or lounge area with the hot tub and the standing outdoor heater.
Standard our models are equipped with a 15 cm diameter chimney single wall.
the chimney is standard delivered in 2 pieces of stainless steel pipe of 1 meter with rain cap.
We can also supply spark arrestors at the chimney.
If you place the Hot Tub under a canopy we can deliver the following:
45 or 90 degree bends