How To Keep a Wood-Fired Hot Tub from Freezing

In today`s article, we are going to discuss two common massage systems that can be installed in the hot tubs. We will also learn the main differences and how to act safely in winter, having these systems in your hot tub. So to break down:

  1. Hydromassage system;
  2. Air bubble massage system;
  3. Winterise these systems for good.

Hydromassage system, what is it?

Hydro massage system is by far the most popular and widely used. The main advantage of this system is the real massage effect on your body. Water runs through the jets, forming quite a strong current which massages the body. The power of the current can be adjusted to one`s needs. The system consists of 6 jets, the water pump, and the required connecting pipes and other parts. Two systems can be connected to the same hot tub as well, thus enabling you to enjoy 12 jets at the same time.

Hydro massage system jets lineup for outdoor hot tubs
Hydro massage system jets lineup for outdoor hot tubs

The power of the pump is 900 W and it connects to a standard 220 – 230 V single-phase socket. In the video below, you can see how the hydro massage system works.

Air bubble massage system, what is it?

This system includes 12 air jets. The main difference between the air bubble and the hydro massage systems is the feel. Air bubble massage system creates a true massage effect with air bubbles running through one`s back. The pump has the optimal 700 W power level, and it connects to the usual 220 โ€“ 230 V European sockets.

Air bubble massage system for outdoor hot tubs
Air bubble massage system for outdoor hot tubs

How to keep wood wood-fired hot tub from freezing

The question which we get from our customers is what to do and expect during the winter period, having theseย massageย systems installed. Well, the main idea is to avoid the water freezing inside the tub and the pipes. Ice, compared with water, expands and takes about 8 % more volume. This extra volume will create a lot of pressure on the surfaces and can easily destroy them. So, what to do?

Firstly, you have to plan the schedule of bathing. Having in mind that the water volume of the decent tub is about 1800 l you shouldnโ€™t be worried about the instant freeze. So, if you plan to bathe the next morning after this wonderful evening, you donโ€™t have to do anything except cover the bath with the lid.ย  Most of our models come with pre-insulated walls, bottom, and the lid, and this will keep water freeze-free even longer. If you have different thoughts, you can always use the extra tools โ€“ small electrical heaters to keep it safe.

Sunken built in hot tub into the terrace winter
A sunken built-in hot tub on the terrace in winter

Leaving the tub full of water for a longer time is not recommended, and water should be drained from the tub and the pipes. Draining the water from the tub is very easy; one just needs to open the valve or the stopper. But what about the pipes? There is an extra easy tip for that. Please pay attention that after the bath is empty, you just need to turn on the systems for 10 seconds, and the water leftovers will be drained as well.

The same principle applies to all the spa accessories, as well as stoves, that connect outside through the water flowing pipes. That includes the heaters as well.

Hot Tub with a whirlpool in winter. Can we leave the water undrained?

Well, this question is quite often asked these days; therefore, we will share our experience owning the tub with a whirlpool function and running it in winter without draining the water.

Is there a risk of having the water freeze and damage the tub? Unfortunately, yes, it is a big risk, and therefore, one must know some things about how to avoid it.

The easiest way would be to drain the water out, so there would be no risk of damaging the tub or various plumbing pipes. But most people would still consider leaving the water undrained, avoiding much hassle of often refilling and therefore saving some money. So how can we do it?

Has anyone noticed a lake and a river in winter? Yes, so most probably you noticed that the lake was frozen and the river’s water was still flowing. So what is the reason for that? It is obvious โ€“ water circulation. So there is no difference with the hot tubs in winter. We must foresee water circulation inside the tub and also in all the pipes. And not to forget that the water’s temperature should not decrease drastically below zero.

Water circulation inside the tub and in its whirlpool piping

So letโ€˜s take that our fully insulated hot tub has water/air massage jets, filtration, and the electric heater connected. All these mentioned accessories will have the water/air circulation pumps. So we would need to turn them on regularly to enable scheduled circulation. Equally important is the water’s temperature. In any case, we canโ€˜t have it below 0 degrees. The electric heater becomes very handy here since it has a thermostat. With the electric water heater, we can set the minimum water temperature to 5 or 10 degrees, and it will start the heating process once the water`s temperature reaches the threshold. If you own the wood-fired heater, which is also connected through the pipes, you must disconnect the heater or better install the water circulation pump since water has to move through the heater as well. Sounds easy, right? But doing it manually will always leave you at home with much hassle. This is where smart technologies such as Wi-Fi-enabled devices come into play.

Using WIFI add-ons to enable the schedule for water circulation

WIFI connection is required, but nowadays most of us have it everywhere. The WIFI addons will let you connect and control the mentioned circulation pumps remotely via the APP or control them with your voice. One of the biggest advantages of these Wi-Fi-enabled devices is the ability to prepare the schedule for water circulation. We can run the circulation for 10 or 15 minutes per hour each day, 24/7, without even remembering it. The duration of scheduled circulation can be decreased or increased depending on the outside temperature, but you will have to test it yourself. One thing to remember is that scheduled circulation must be cancelled if the water is drained from the tub. Failing to do so will result in damaged water pumps.

*The voice control is activated using Google Assistant or Amazon Alexa apps.


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