Both have an integrated boiler and can be connected to a gas or oil heating system or can be connected to a solar system. The smaller Compress 4000 DW uses indoor air and the larger Compress 5000 DW ...
Replace the Junkers TRQ 21 room thermostat with a Shelly Plus Uni on the 1-2-4 interface — smart, 4-level control for older Junkers/Bosch gas boilers (ZWR, ZSBE, ZWN). Ready for Home Assistant.
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