Product Information
Control Unit HT3 GZT5-II Bosch USA
Please note: Hydrowest Products Ltd. is a wholesale distributor and sells exclusively to licensed contractors and trade professionals.
Fast Shipping
In-stock orders ship within 1 business day to anywhere in Canada.
Code-Compliant
All products meet Canadian HVAC and gas code standards.
Wholesale Pricing
Trade pricing for licensed contractors. 40+ years in the industry.
Bosch Control Unit HT3 GZT5‑II (PN 87377046710) is an OEM replacement control module intended for Bosch Heatronic/HT3‑equipped boilers and heating appliances, providing the service-level interface used during maintenance or module replacement for EMS/HT3 systems. Designed for professional installers and service partners, it supports diagnostic and control restore workflows—verify exact model fit and installation procedures against Bosch technical documentation, since a Bosch North America product page for PN 87377046710 was not located. (bosch-homecomfort.com)
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