Angelery / Water Wizard

What’s the magic behind the WaterWizard’s history of reliability, low maintenance and energy efficiency?

The answer is the superior technology of a 30+ year proven design. Its free-floating helical coils naturally wind and unwind with temperature changes – virtually eliminating thermal stress. This inhibits scale formation and helps to break down buildup during normal operations.


Whether the application is commercial or industrial, this steam-to-water heater delivers:

  • 90%-99% thermal efficiency; More useable heat for every pound of steam;
  • Precise ±4°F temperature control;
  • Low-temperature condensate (<160°F) saves energy;
  • Shock-free heat exchanger;
  • No traps, storage tanks, blending valves or temperature mixing equipment;
  • Compatible with low or high steam pressures;
  • Small foot simplifies installation;
  • 2004 Buildings magazine “Top Product Pick”.
System Efficiency

Widely recognized as the most thermally efficient water-to-water heat exchangers available for potable water heating, SmartPlate heaters incorporate a stainless steel, brazed plate (single-wall) or plate and frame (double-wall) style heat exchanger applied in a counter flow design. As a result, SmartPlate water heaters can utilize boiler water as little as 5°F above the desired DHW temperature. They are ideal for use in low temperature systems!

  • Eliminate waste associated with overheating DHW and then “mixing down” to safe temperatures
  • Low supply water temperatures maximize boiler plant efficiency
  • Pair with condensing boilers to further increase fuel savings
  • Minimize radiant losses throughout the system
  • A lower system set point produces far less scale for increased thermal efficiency, reduced maintenance and a longer heater life
  • Minimize over temperature conditions and potential for scalding

Principle of Operation

The Angelery Heat Exchanger is a vertical-cross flow unit whereby modular helical coils are mounted between vertical inlet and outlet risers.

The primary enters the coil from the inlet risers, flows through all coils in parallel, and discharges from the outlet risers.

Secondary fluid flows through the shell from the bottom to top, passing over the coil in series.

The unique Compensator maintains accurate and stable temperature control under widely varying load conditions.

The thermal element located in the compensator unit senses a temperature, which are a function of both the secondary fluid final outlet temperature and the rate of secondary fluid through the heater. A change in flow rate causes the unit immediately to anticipate the need for more or less primary fluid to meet load demand without having to wait for a change in final outlet temperature.

By design, the Angelery provides a storage volume of hot water maintained at the required temperature. Immediately any draw-off takes place with a low velocity flow of secondary fluid over the coils, the sensitivity of the Compensator unit and the resultant instant operation of the control valve, to allow primary fluid to enter the coils, reduce surge draws on the energy source.

The helical coil design permits flexing under constantly varying pressures and temperatures without damaging the coils or over-stressing the material. This flexing action tends to provide automatic descaling of solids precipitated from the secondary fluid and deposited on the coils in the form of hard scale.

On steam applications, the liquid passes over each coil in series and the vapour flows through each coil in parallel creating a ratio of condensing surface to sub-cooling surface in each individual coil. This ratio varies in accordance with load and increase in accordance with the location of the coil from bottom to top of the heater. Thus, at maximum rated capacity, all coils accept the uppermost act to sub-cool the condensate.

Compensator Principle of Operation

The secondary fluid flows through the heater shell from bottom to top. In addition, the heated fluid, being of less density than unheated, moves to the top of the shell by convection. These actions result in the hottest water being at the top of the heater – at the heater outlet and at the hot water inlet of the Compensator unit.

Cold water entering the heater flows down through the cold water leg of the Compensator unit and out into the bottom of the heater shell. This flow, through the orifice, draws water down through the hot water leg of the Compensator unit drawing both cold water through and bypass and hot water from the top of the shell, into the hot water leg.

The thermal element “reads” the average temperature of the water in the hot water leg at any given moment and signals the primary (heating) fluid control valve to open or close as necessary to maintain the required heater outlet temperature.

With no demand or load on the heater, the thermal element “sees” only the temperature of the water at the heater outlet and, if the water is at the required temperature, signals the primary control valve to close.

However, the moment that there is a demand for hot water (an increase in load), entering cold water mixes with the hot water in the Compensator unit, cooling the thermal element and thus signalling the primary fluid control valve to open. The need for heat flow to the heater coils is satisfied at once and the heater outlet temperature does not fall below that required.


The Angelery will sub-cool the condensate where the bulk of the incoming water is less than 43°C (110°F).

A trap is therefore not required and an orifice plate can be used. Above this temperature a float or bucket trap is used.


Standard materials of construction are as follows:

Shell: Carbon Steel, Copper Lined
Coils: Copper
Internal Risers: Red Brass
Compensator Assembly: Copper and Bronze
Heads: Bronze
Legs: Carbon Steel

As an alternative Stainless Steel construction is also available. All units are supplied complete with insulation and cladding.

Installation Diagrams

Packaged Units

The Angelery packaged unit is designed and built to the customer’s requirements.

The package is complete with all valving, controls, gauging and pipe fabrication ready to be connected into the appropriate services in the customer’s premises.

Please consult Northvale Korting sales for further details.

Contact us with any enquiries and we will be happy to help.