A four-chamber model designed generally for domestic water heating in whole house and booster applications.

This on-demand tankless water heater is a powerful replacement for traditional tank-type heaters and is the enabling technology for use as back-up to active renewable energy systems such as solar and geothermal water heating systems. The temperature activated control works effectively in re-circulating systems and in combination with tank-type heaters.

Seisco RA-28

The RA-28 is the most popular residential model for providing a continuous supply of hot water for as long as you need it. Minimum 200 Amp Whole House Electrical Service recommended.   

Ideal for the whole house and some commercial* applications such as specialty restaurants, convenience stores, salons, and pet-grooming shops.

Seisco RA-22

The RA-22 is a residential model providing a continuous supply of hot water for as long as you need it. Minimum 150 Amp Whole House Electrical Service recommended.

Ideal for the whole house, apartment or condominium dwelling where incoming water temperature rarely drops below 55 degrees F. Excellent for split systems serving individual entities such as lavatories, shower/bath rooms and kitchens.

Seisco RA-18

The RA-18 is the perfect supplement to an existing tanktype water heater that is unable to satisfy the user requirements. A minimum of 125 Amp whole-house electrical service is recommended.

Ideal for the whole house, apartment or condominium dwelling, where incoming water temperature rarely drops below 65 degrees F. Excellent for split systems serving individual entities such as lavatories, shower/bath rooms and kitchens.

APPLICATIONS AND DIAGRAMS

Selection Criteria, Applications and Diagrams [PDF Format]
In the above document you will find:

Selection Criteria

• Basic information needed for selecting the proper Seisco model

Residential Floor Plan Diagrams

• Standard One Story Home Options
• Standard Two Story Home Options
• One Story – Booster for Quicker Response
  

Application Diagrams:

• General Residential - Whole House
• Booster Retro-fit for Existing Storage Tank
• High Flow or Large Demand Configuration
• Circulating System Arrangement
• Space Heating – Radiant Floor or Hydronic Heating System
• Space Heating – Indoor Hydro Heating or Heat Pump System
• Passive Heating – Combined with Indoor Storage Tank
• Solar Backup – Combined with Solar Heated Storage Tank
• Geothermal Backup – Combined with De-Super Heater