Booster Water Heaters
sanitization of dishes, glassware and utensils is required
by health and plumbing codes and essential to meeting customers'
safety expectations and protecting a business's valued name.
A booster water heater raises or "boosts" the temperature
of the water in the final rinse cycle of a food service warewasher
from the typical, safer temperature of 140°F delivered
by the water heater to the 180°F temperature required
by health codes. The water is heated using either a conventional
burner or infrared burner technology in gas models or electric
heating elements in electrically operated units.
booster water heater is a practical solution to meeting sanitation
requirements that offers many advantages over the alternative,
chemical sanitization. The use of a chemical rinse is corrosive
to dishes and glasses as well as warewashing equipment, a
problem that is eliminated with a booster water heater. The
high temperature of the rinse water lets dishes dry faster–about
25% faster-minimizing unsightly watermarks and wet, slippery
floors. The higher water temperature also does a good job
of removing tough substances such as lipstick, dried egg and
types of booster water heaters are available, including storage-style
models, instantaneous units, boiler-type water heaters with
a small built-in storage tank and units that are integrated
with the dishwasher. Under-the-counter, floor standing and
wall-hung units are common. Venting options in gas models
include natural draft, power assisted and, at least one manufacturer
offers a sealed combustion unit.
If the booster water heater is not integrated with
the dishwasher, it is placed as close to the warewasher as
possible, usually within five feet or less, to insure that
hot water is delivered to the final rinse at the requisite
temperature. Water from the building's water heater supply
is fed into the inlet side of the booster water heater at
140oF where it is heated to 180oF and delivered to the final
Energy inputs range from as low as 28,000 Btu/hr
up to almost half a million Btu/hr. Higher energy inputs generally
are found in boiler-type units, although one manufacturer
offers an instantaneous model capable of 495,000 Btu/hr. Generally,
booster water heaters are not designed to store any significant
quantity of heated water so most tank-style units offer storage
for only 3 to 17 gallons, however, some models are available
with storage up to 100 gallons.
Booster water heaters can be fueled by natural gas,
electricity or propane. Gas models cost less to operate than
electric booster heaters and can help reduce demand charges.