Hydronic heating through the HRV supply air
These are products I'm considering that deliver space heating through
the supply airflow. The heat source is the hot water heater. The
heat gets into the airflow using a hydronic coil (like a car
radiator). In Europe they can buy a compact heat-pump unit that does
all of this in one package. In the U.S., we've had to cobble this
together from different parts. Some complete products are now
available that also incorporate the ERV/HRV.
1. NTI (Nyletherm) Matrix. Complete ERV, condensing gas hot water
heater, and hydronic coil.
2. Lifebreath Clean Air Furnace. ERV and hydronic coil, but supply
your own hot water.
3. Nuair heat recovery air handler. Like the Lifebreath, supply your
own hot water.
4. Turbonics, Inc. HDX-17 and HDX-34. These are hydronic fan coils
that would fit in the supply airflow from the HRV. Designed for 120ºF
water. John Mann at HeatWave Radiant Supply in Ceres.
5. Atrea "Duplex RK2". Designed for passivehouses. Incorporates the
hydronic coil into the HRV like #1-3 above. This is one of dozens
available in Europe, but available in the U.S.? Most likely not.
George points out that the first three products are designed for
heating loads much higher than for a passivehouse, so the components
are oversized and need adjustment to fan speed and water flow rate or
temperature. Number four could also be tailored to a passivehouse
Is there anything else available off-the-shelf? Is it worth shipping
a heat pump unit from Europe? (The refrigerants are different--they
use propane!--and the voltage is different.) While we're dreaming,
why not import this one:
6. NIBE Fighter 410P. Complete ventilation with heat recovery, hot
water, and space heating in one refrigerator-sized appliance.