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For a long time, domestic chimneys were open hearths and only showed a yield of 25 to 30%. By closing the fireplace with a window, in a metal box, we went to the insert or closed hearth allowing a very significant increase in performance. In both cases, open hearth or closed hearth, it is possible to further increase this output using a heat recovery. Explanations.

How to feed a hot water tank with a heat recovery unit?

Can we install an air-water heat recovery unit in the chimney? Can it feed a mixed electric hot water tank? Where to find an installation diagram?

Theinstallation of an air-water heat recovery unit allows to feed a hot water tank, since it can power one or more radiators. Generally, this device comes in relief or in addition to a heating system with wood boiler or pellet.
The installation integrates a expansion tank, to take into account the pressure variations in the circuit related to the operation of two parallel heating sources.
Connection to a mixed ball (electric) is possible. The installation diagram is available in the downloadable instructions on the Ecoflamme website.

How to distribute the heat recovered from a closed fireplace upstairs?

To recover the heat from the hood of a closed fireplace, which is on the ground floor, and heat three bedrooms, two of which are upstairs, it is planned to install a heat distributor. This one can not be put in the attic, is it possible to place it in the false ceiling of the ground floor, with the sheaths that will go, too, the false ceiling, to then cross the floor until to the rooms?

Use the false ceiling on the ground floor to pass the ducts is a good idea in principle, provided that the heat released by these sheaths does not cause overheating or even fire. The problem is particularly noticeable if the floor is wood. In general, ducts should be insulated to limit their surface temperature and sufficiently distant (at least 10 cm) from any element of wood or fuel.
Information about duct heat recovery systems is available at the Poujoulat site.

How to recover and distribute the heat of a wood stove?

In a house, to optimize heating with a wood stove, the owner plans to build behind a stove and against the Placo®, a small wall of refractory bricks. Is it wise and feasible?

The purpose of this "small refractory brick wall" is not specified.
If it's for protect the wall from heat, just respect the distance recommended by the stove manufacturer between the back of it and the wall. Ten centimeters is generally recommended.
If it is about recover heatThe simplest way would be to choose a high-quality cast iron stove that combines radiation and convection and install a heat distribution system connected to the duct that distributes the heat evenly throughout the home. In this case, it is advisable to call on a professional who will check the compatibility of the conduit and the good compliance with the NF DTU 24.1 Standard when installing the system.

What type of heat recovery unit to choose for an open fire?

At an open fireplace, is it better to install a heat recovery unit Tifon and a brand Equatair, cheaper? Are these products reliable?

Both heat recovery systems are reliable, but the models Tifon are perhaps both more compact and more aesthetic. This brand is also proven for many years.
To work well, the Equatair ventilation system, a newcomer offered in DIY superstores, must be sized to the size of the fireplace (that is, it must occupy the entire floor of it). It must be raised a few centimeters from the floor of the fireplace so that it is heated both below the embers and above the burning wood. It should not be placed directly in the ashes, because the system will lose its effectiveness.

In addition to the products offered by these two brands, there is also a system of heat recovery and distribution interesting developed by Poujoulat.

Is it better to install an air / air or air / water heat recovery unit?

To reduce gas consumption (central heating), it is planned to install a closed fireplace. Two solutions are envisaged:
- put a kettle and connect it to the condensing boiler;
- install a fireplace with ventilated ducts to bring warm air to other rooms in the house.
What is the best solution? Is a kettle heater likely to damage the boiler due to too high a temperature?

Both solutions are possible. But the system "kettle", that is to say the air / water recuperator, unfortunately too little used, is certainly the most effective, especially in combination with a boiler.
One of the few collector manufacturers of this type is Piros. An expansion vessel and a thermal valve will effectively protect the boiler.

On the same topic

  • Questions answers
    • Should we heat unused rooms?
    • How to diffuse the heat emitted by a pellet stove?
    • Install a buffer tank under sink
    • What diameter for a water supply pipe (Plymouth)?
    • What is the price of a heat distributor for Poujoulat wood stove?
  • DIY tips
    • How does a heat recovery system work?

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