
iQ251D
iQ Series — Deionized
The wall-hung iQ251D on-demand water heater is designed to be a commercial “workhorse.” Each unit delivers 251,000 BTU/hr and is ideal for highly variable applications using deionized hot water. Ideal where space is at a premium, the iQ251D is the most compact and only gasfired, deionized on-demand water heater on the market.
Technical Documents
iQ251D Key Features:
- Masterless Cascading – Eliminate single-point failure with multiple units. If one is offline for servicing, all other units regroup and continue to operate.
- Eliminate Mixing Valves & Lower Legionella Risks – With no storage tanks, there’s a lower risk for Legionella growth. By eliminating the need for mixing valves, this feature also reduces their associated unreliability and costs.
- 316L Stainless-Steel Construction – The unit is durable, built to withstand highly corrosive deionized water.
- Flexible Heat Exchanger – Built to accommodate quick temperature changes and continual on-off cycles with minimal stress.
- Compact Unit – Nearly the size of a carry-on suitcase (26”x17”x15.9”), the units each weigh approximately 100 lbs.
- ASME-HLW Compliant – Suitable for applications managed by engineers, specifiers and contractors.
- Natural Gas – By using natural gas our systems lower operating costs and improve ROI vs. electric water heaters.
- High Power, Small Package – Our units require as little as 73KW, substantially less than electric water heaters with no need for 440V or large amperage.

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