Diversified Heat Transfer and SWEP Double wall brazed plate heat exchangers make an extremely efficient heating duo

When Diversified Heat Transfer (DHT) began to develop their innovative new line of fully packaged storage water heaters, they knew that they wanted SWEP as their trusted heat transfer partner for this endeavor.

DHT manufactures innovative, technology-driven products

Diversified Heat Transfer (DHT) is a leading engineering and manufacturing company of heat exchange equipment and systems for the residential, commercial, and industrial markets. With more than 80 years of experience, DHT can design, build, and manufacture innovative, technology-driven products that provide flexible, high-quality, and cost-effective solutions for a wide variety of applications.

One of their newest line of products, the STP Series, is a fully packaged storage water heater that utilizes double wall brazed plate heat exchangers to optimize heat transfer through generating more efficient and faster hot water replenishment of the storage tank. DHT knew that SWEP had a strong brand name in the industry and was known for delivering high quality products, so bringing them onboard was an easy decision.

Brazed plate heat exchangers are one of the most efficient ways to transfer heat and are designed to provide unparalleled performance with the lowest life-cycle cost making them an easy choice for DHT. Choosing brazed technology for your next heating or cooling project will bring many benefits, including savings in space, energy, and maintenance.

                                               Diversified's STP Series.

Efficient, stable, and reliable performance with SWEP´s brazed plate heat exchangers

With SWEP being a world-leading supplier of brazed plate heat exchangers for HVAC and industrial applications, DHT knew our brazed plate heat exchangers provide efficient, stable, and reliable performance in a robust and easily handled unit. Our vast experience in residential heating covers both comfort and tap water heating. Typical applications for our brazed plate heat exchangers are gas boilers, heat pumps, and solar heating, along with other decentralized heating technologies such as micro-combined heat and power systems and absorption heat pumps. 


For Diversified’s STP series, the SWEP B35TDW (Double-wall) model, which is a very strong, effective unit in higher capacity heating applications, was selected for the job. The double-wall range of brazed plate heat exchangers combine high efficiency with double-wall technology while keeping the advantages of the brazed plate heat exchanger – including compactness. Double wall products are dedicated to applications where the fluids must not mix and makes any internal leaks visible – important factors in applications where safety is a priority. 


AHRI’s certification programs

Another deciding factor that led to SWEP brazed plate heat exchangers being chosen for this line was the fact that they are AHRI certified which made them completely compliant with the plumbing code that had to be adhered to. SWEP is the first company to provide brazed plate heat exchangers certified by the Air-Conditioning, Heating, and Refrigeration Institute (AHRI). AHRI’s certification programs are well-recognized as a performance verifier for heating, air conditioning, and commercial refrigeration equipment. The products undergo testing by independent laboratories under contract to AHRI and are evaluated using the appropriate industry standard to certify that published performance ratings are accurate. This allows buyers to make a fair comparison when selecting products for their HVAC installations and offers additional security when selecting brazed plate heat exchangers for your HVAC installations. 

STP Series brings operational and cost benefits

Ideal for a variety of new and retrofit water-to-water heating applications that require little to large storage volume capacities, the STP Series brings operational and cost benefits by supporting a variety of water-to-water heating applications for apartment complexes, correctional facilities, hospital and other healthcare centers, hospitality settings, colleges and universities. DHT has developed the STP Series with a modular design that allows multiple simplex and duplex heat exchangers to be stacked for efficient built-in redundancy and extra capacity in a small footprint. Maintenance is also improved through the design, as it allows each heat exchanger to be isolated for cleaning and servicing to eliminate system downtime which also saves on costs. 

Other notable features of the STP Series are:

  • Recovery rates from 600 to 10,800 GPH with 180F boiler water for 100F temperature rise.
  • Tank Sizes ranging from 175 to 500 gallons standard. (765-1000 gallons special order)
  • Domestic storage temperature control range 50-180F.

A compact footprint

According to DHT, installation is simple in both retrofit environments and new facility designs. The STP Series has a compact footprint and comes fully assembled in a skid-mounted package for quick and easy single point connections. For those with limited space conditions the piping and wiring connections can be easily removed and assembled so you can move the unit components inside the building without difficulty.  This is another major reason why a SWEP brazed plate heat exchanger was perfect for this job as they can perform the same job as the older, larger technologies (i.e. Plate & Frame, Shell & Tube, etc.) in a much smaller, customizable envelope. 

A couple of STP Series installed in a mixed use commercial building.
A couple of STP Series installed in a mixed use commercial building.

An STP Series installed at a public high school in New Jersey.
An STP Series installed at a public high school in New Jersey.

Energy efficiency, water savings and maintenance

DHT is also proud to announce that BUILDINGS has selected STP Series Water Heater as a 2020 Money-Saving Products winner. This product is a member of an elite group of 45 products showcased in the May/June 2020 issue of BUILDINGS and online at www.BUILDINGS.com.

Finalists were evaluated by the BUILDINGS editorial staff for the money-saving qualities they offer to building owners and facility managers in areas such as energy efficiency, water savings and maintenance.

DHT’s mission is to engineer and manufacture a family of high-quality heat transfer products, while exceeding customer expectations and building lasting partnerships.  That is why SWEP and Diversified make such a great team when it comes to challenging efficiency in heat transfer applications across North America.