Shower heat recovery
With a shower heat recovery unit, heat from the draining shower water is used to preheat cold water. This is done with a heat exchanger. This ensures that the preheated water goes to the mixer tap of the shower and/or to the central heating boiler or water heater.
Hot and cold water flows through the heat exchanger separately from each other. The cold and warm water are therefore not mixed but flow past each other in opposite directions. This allows the cold water to absorb a lot of heat from the hot water. As a result, you use about 40 to 50 percent less gas or electricity for showering.
Do you have renovation plans for your bathroom or are you moving to a new home? These are ideal times to have a shower heat recovery unit installed.
Is my home suitable?
You can combine the shower heat recovery unit with any heating appliance. So it doesn't matter if you have a high-efficiency boiler, electric boiler, or heat pump.
The heat recovery unit has a short warm-up time. So it takes a while before he has his full return. But with an average shower of 7.5 minutes, you can save 40 to 50 percent of the energy used to heat water.
Placing a shower heat recovery unit in the drain pipe or shower tray/shower drain requires a (small) renovation of your bathroom. So choose the right time for installation: if you are going to renovate the bathroom or move to a new home.
There is also a separate shower heat recovery unit that you place on the floor of the shower cubicle. No renovation is required for this.
A shower heat recovery unit lasts 30 years. The materials (mainly metal) are easily recyclable. The environmental impact of this is very small (and minimal compared to the environmental benefit).
Types of shower heat recovery unit
Shower pipe heat recovery: vertical
If the bathroom is on a floor (so not on the ground floor), you can take a shower pipe heat recovery unit. This is an approx. 2 meter long double-walled pipe with a copper inner pipe that replaces the normal drain pipe. It should be placed as close to the shower as possible. The shower water flows down the inner tube, the clean supply water flows up the outer tube. A small renovation is required to install the pipe (the drain pipe is not directly under the shower drain, but in or along the wall of the floor below).
Shower heat recovery with lift pump: vertical
An alternative is a vertical shower heat recovery unit with a lift pump that is built into the wall next to the shower. It works almost the same as a shower pipe heat recovery unit, except that a pump first pumps the drain water up. The efficiency is almost as high as that of a shower pipe heat recovery system. The pump does consume some power, but that is negligible compared to the energy you save.
Shower drain or shower tray heat recovery unit: horizontal
Is the shower on the ground floor or do you live in an apartment? Then a vertical shower pipe heat recovery system is not possible (except for the variant with a feed pump, which is possible). You can then take a horizontal shower heat recovery unit that is built into the shower drain or shower tray. The most convenient time for this is when you renovate the bathroom.
Separate shower heat recovery unit
There is a 'separate' shower heat recovery unit for existing showers. You can install it without renovation. It is a flat plate that you place on the shower floor and connect to the mixer tap of the shower. So while showering you stand on the plate.
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