Instantaneous Water Heater only consumes energy on demand.

Press Release Summary:

Equipped with feed-forward temperature control system, RediHeat instantly produces hot water within ±4° of set temperature under varying demands. Unit features spiral tubed helical heat exchanger for efficient heat transfer, plus rugged casing and bourdon tube configuration that allows entire assembly to expand and contract without localized stressing. With blending valve fail-safe design, consumers are protected from being exposed to hot water at temperatures above set point.

Original Press Release:

Spirax Sarco Introduces the RediHeat Instantaneous Water Heater

Blythewood, SC – Spirax Sarco is pleased to release the RediHeat instantaneous water heater designed with a unique feed-forward temperature control system to instantly produce hot water within +/-4°F of the set temperature under widely varying demands. This outstanding performance makes the Rediheat the ideal solution for hot water applications where tight temperature control and instant response to changes in demand are required.

The Rediheat features a spiral tubed helical heat exchanger for efficient heat transfer in a compact space. The rugged casing and bourdon tube configuration allows the entire assembly to expand and contract without localized stressing, ideal for intermittent cycling common with domestic hot water applications.

The simple mechanical design allows the water temperature to be controlled by a mechanical blending valve that operates based on demand. A manual adjustment compensates for seasonal changes in cold water supply temperature.

The unit requires no extraneous power sources, controls or temperature sensors making installation a snap. When maintenance on the helical heat exchanger is required, the coiled tube bundle can be either cleaned in placed or removed for cleaning.

The RediHeat only consumes energy on demand. This mode of operation can save as much as 40% in energy costs when compared to a hot water tank system.

Vital for domestic hot water applications, the Rediheat has a blending valve fail-safe design. This safety aspect protects consumers from being exposed to hot water at temperatures above set point. Also with the RediHeat’s feedforward design water is over-heated to 160°F – 200°F in the heat exchanger before being blended with incoming cold water to the desired output temperatures. In this way the presence of stagnant water at bacteria-friendly temperatures is eliminated.

Contact your local Spirax Sarco representative to determine if RediHeat is right for your facility.

About Spirax Sarco, Inc.

Spirax Sarco is the world leader in steam system management. The Company provides a broad range of fluid control products, engineered packages, systems expertise and site services for its diverse range of over 100,000 industrial and institutional customers. The Company helps its customers to optimize production capacity, reduce energy costs and emissions, improve product quality and enhance the safety of their operations. Spirax Sarco has strategically located manufacturing plants around the world and employs approximately 4,700 people, of whom around 1,300 are direct sales and service engineers. Further information can be found at

For further information about application areas and user experience please contact:

Tele: 800.883.4411


Press and Media contact:

Tracy Britt

Spirax Sarco Inc.

Voice: (803) 714-2036

Fax: (803) 714-2222



More from Software

All Topics

COVID-19 Response Suppliers COVID-19 Response:
Can Your Company Help Provide Critical Supplies?

We are using the power of our platform to aid in the mass shortage of critical supplies. If your company can help provide supplies, capabilities, or materials for products such as N-95 Masks and Tyvek SuitsPlease let us know.

COVID-19 Response Suppliers