Drazice OKC NTR/HR Heat Pump Storage Water Heater with Buffer Tank

The OKC NTR/HR series is an integrated heat pump water heater combining an enamelled domestic hot water cylinder (200 or 302 L) on top and a heating buffer tank (100 or 120 L) below in a single vertical casing with heat exchanger surfaces up to 3.2 m².

The Drazice OKC NTR/HR series is a space-saving, all-in-one domestic hot water and buffer storage combination specifically designed for modern heat pump installations and low-temperature heating systems.

The upper section houses an enamelled domestic hot water cylinder with a large-surface heat exchanger, while the lower section accommodates a buffer tank for the heating circuit. Combining both tanks into a single compact vertical unit optimizes footprint in boiler rooms and technical utility spaces.

Key Features & Advantages

• Integrated Dual-Tank Architecture: Domestic hot water cylinder on top and hydraulic buffer storage tank at the bottom.
• Large-Surface Heat Exchanger: 2.1 m² (Model 200) and 3.2 m² (Model 300) heating surface areas optimized for heat pumps and low flow temperatures.
• Rapid Reheating & Ample Flow: Reheats domestic water from 10°C to 60°C in just 21 minutes (Model 300).
• High-Grade Corrosion Protection: Enamelled steel inner tank equipped with a protective magnesium anode.
• Auxiliary Electric Heating Option: Side flange allows installation of supplementary screw-in electric heating elements.
• High Energy Efficiency: Energy efficiency class „B“ with only 65 W standing loss on Model 300; 80 mm removable thermal insulation on Model 200.
• Operating Parameters: Maximum tank operating temperature/pressure 80°C / 6 bar; heat exchanger 110°C / 10 bar.

Available Models

• OKC 200 NTR / HR 120: 200 L DHW storage + 120 L heating buffer tank, 2.1 m² heat exchanger area, 80 mm removable insulation.
• OKC 300 NTR / HR 100: 302 L DHW storage + 100 L heating buffer tank, 3.2 m² heat exchanger area, ErP Class B.