The offer from our general contractor includes the central mechanical ventilation system Helios EC 370 W.
So far, I haven’t found enough information about Helios systems here in the forum to form a clear opinion.
Does anyone have experience with a central mechanical ventilation system by Helios or currently use one?
I would opt for the system with an enthalpy heat exchanger, which would be the EC 370 W ET model.
Based on the floor plans, I calculated an interior volume of approximately 440 m³ (15,520 ft³).
If I’m not mistaken, the system’s capacity should be suitable.
The datasheet lists airflow rates at three settings: 350 / 200 / 140 m³/h (205 / 118 / 82 CFM).
So far, I haven’t found enough information about Helios systems here in the forum to form a clear opinion.
Does anyone have experience with a central mechanical ventilation system by Helios or currently use one?
I would opt for the system with an enthalpy heat exchanger, which would be the EC 370 W ET model.
Based on the floor plans, I calculated an interior volume of approximately 440 m³ (15,520 ft³).
If I’m not mistaken, the system’s capacity should be suitable.
The datasheet lists airflow rates at three settings: 350 / 200 / 140 m³/h (205 / 118 / 82 CFM).
Hello,
we also initially planned a Helios 370 but changed it to a Zehnder 350 at the last minute.
My dealer apparently had quite a bit of trouble with Helios systems in recent months and even had to remove one Helios unit and replace it with a Zehnder. There were issues with the heating coil at low air volumes.
Whether this is true or if he just makes more profit on Zehnder units, I can’t say. In any case, the Zehnder was roughly the same price, so there was no difference there.
What I have read several times, though, is that the Helios 370 becomes very loud during bypass mode because the air then passes through a smaller filter. This could be a problem for you since you apparently are building without a basement.
Regarding size: What air exchange rates do you want to achieve? We have about 670 m³ (24,000 ft³) of ventilated space, and the ventilation system runs at 230 m³/h (135 cfm), so an air exchange rate of about one-third per hour. That is completely sufficient!
A very large ventilation unit in the basement doesn’t help if you don’t have the appropriate ductwork for it. For exchange rates around 1 per hour, you will need multiple outlets per room. Do you want that? And for what purpose?
Best regards,
Andreas
we also initially planned a Helios 370 but changed it to a Zehnder 350 at the last minute.
My dealer apparently had quite a bit of trouble with Helios systems in recent months and even had to remove one Helios unit and replace it with a Zehnder. There were issues with the heating coil at low air volumes.
Whether this is true or if he just makes more profit on Zehnder units, I can’t say. In any case, the Zehnder was roughly the same price, so there was no difference there.
What I have read several times, though, is that the Helios 370 becomes very loud during bypass mode because the air then passes through a smaller filter. This could be a problem for you since you apparently are building without a basement.
Regarding size: What air exchange rates do you want to achieve? We have about 670 m³ (24,000 ft³) of ventilated space, and the ventilation system runs at 230 m³/h (135 cfm), so an air exchange rate of about one-third per hour. That is completely sufficient!
A very large ventilation unit in the basement doesn’t help if you don’t have the appropriate ductwork for it. For exchange rates around 1 per hour, you will need multiple outlets per room. Do you want that? And for what purpose?
Best regards,
Andreas
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