Heat Interface Units and System Components

The heat interface units of the HIU2 series are compact heat transfer stations designed for hygienic domestic hot water production and reliable heat distribution in single-family homes, multi-family dwellings, and multi-storey buildings. They are compatible with all common heat sources, including conventional boilers and modern heat pumps.

The HIU2 HKM variant is specifically designed for mixed circuits typically found in surface (underfloor) heating systems.

The HIU Heat Comfort units feature EPP insulation and electronic control, ensuring energy-efficient operation and user-friendly temperature management.

Case Study HIU2


Watts HIU 2 HK heat interface unit for unmixed heating circuits, featuring a plate heat exchanger, priority switch for domestic hot water, integrated adapters for heat and cold water meters, space-saving design, front view.hiu2 hk

Heat Interface Unit HIU 2 HK for unmixed heating circuits

View products hiu2 hkmhiu2 hkm

Heat Interface Unit HIU 2 HKM for mixed heating circuits

View products Watts HIU Heat Comfort Compact E heat interface unit, compact vertical design with plate heat exchanger, circulator pump, brass valves and LCD controller, left-side front perspective.“Watts HIU Heat Comfort Compact E heat interface unit, black EPP-insulated front panel with integrated LCD controller, front view.

Heat Interface Unit HIU Heat Comfort Compact E with integrated electronic control

View products Watts HIU Heat Comfort E heat interface unit, internal view with plate heat exchanger, circulator pumps, brass valves, and LCD controller, left-side front perspective.Watts HIU Heat Comfort E heat interface unit, black EPP-insulated front panel with integrated LCD controller, front view.

Heat Interface Unit HIU Heat Comfort E with integrated electronic control

View products one piece wall mounted cabinet hiu2vsaione piece wall mounted cabinet hiu2vsai

One-piece wall-mounted cabinet HIU2VSAI

View products cabinet hiu2acabinet hiu2a

HIU2AI-2 wall mounted cabinet

View products one piece flush mounted cabinet hiu2vsuione piece flush mounted cabinet hiu2vsui

One-piece flush-mounted cabinet HIU2VSUI

View products cabinet hiu2ucabinet hiu2u

HIU2UI-2 flush mounted cabinet

View products manifold hkv2013a va 1point25manifold hkv2013a afc for hiu2

Stainless Steel Manifold with automatic flow control HKV2013A-AFC for HIU2

View products HKV2013A VA heating circuit manifold made of stainless steel by Watts for HIU2 residential stations, 6 circuits, return with blue adjustment caps, flow with flow meters, on wall bracket, diagonal front view.

Stainless Steel Manifold HKV2013A VA for HIU2

View products hiu2 connection set hkhiu2 connection set hk

HK connector set

View products hiu2 connection set hm

HKM and HKM-HT connector sets

View products hiu2 circulation set

HIU2 circulation kit

View products hiu2 thermal bridgehiu2 thermal bridge

HIU2 circulation bridge

View products hiu2 wsd

Water hammer arrestor set HIU-WSD

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