WATER OR
PRODUCT
OUTER
JACKET
INNER
JACKET
STEAM
UNDER
PRESSURE
BOILING
WATER
HEATING
ELEMENTS
(ELECTRIC)
1
Introduction to Steam Jacketed Kettles
Steamjacketedkettlescookfaster,yetcostlesstooperate,andprovidemoreeven,gentleheating.
Howdotheydeliverthisuniquecombinationofpowerandcookingprecision?
The Amazing Thermal Efficiency Of Steam...
Steamcarriesapproximatelysixtimestheenergyofboilingwaterandgivesupthatenergyupon
contactwithacoldersurface.Thissimplefactmakessteamanidealheattransfermedium,and
steamjacketedkettlestheidealwaytocook,reheatandholdawidevarietyofmenuitems.
Unique Kettle Construction...Asteamjacketedkettleisformedfromtwostainlesssteel
hemispheres,whicharenestedandweldedtoformaspaceor“jacket”tocontainsteam.
Groen Kettles Cook Faster
A stock pot only transfers heat on the bottom. A kettle transfers heat through the entire jacketed
bottom and sides. Steam jacketed kettles have 3-4 times more heat transfer surface area than
the same size stock pot, which means faster heat up and faster cook times.
Groen Kettles Are More Efficient
Kettles transfer more of their energy into the food product. Range burners only heat the bottom of
the stock pot and can be inefficient. Groen gas heated kettles are 58-65% efficient and electric
models are even more efficient. Faster cook times mean less energy used and lower fuel bills.
Direct steam kettles can operate from an existing steam source, for even greater energy savings.
Groen Kettles Save Labour
A single chef or cook can prepare larger batches of your soups and other popular menu specialties,
in a steam kettle. With even heating and precise temperature control, there is less need for
constant "pot watching" and frequent stirring. Gear assisted manual and power tilts make product
transfer and portioning fast and easy. With larger single batch capabilities, you can reduce
repetitive work and utilise more automated prep equipment. Kettles are major labour savers.
Groen Kettles Improve Consistency & Reduce Product Loss From Burn-on
Groenkettles don'thave "hotspots" anddon't requireconstant stirring toavoid productburn-on and
scorching.Steam jacketedkettles areideal forpreparation ofdelicate sauces,cream basedsoups,
dessert fillingsand heatsensitive confections.Even unskilledemployees canconsistently cook,reheat
andhold menuitems, batchafter batch,day afterday. Groenkettles aremore "forgiving"than range
toppreparation methodsand theymake employeetraining easier.
Groen Kettles Reduce Heavy Lifting...
Counterbalanced tilting kettles and models equipped with product drawoff valves reduce the need
for heavy lifting and simplify product transfer and portioning.
Groen Kettles Are Easier To Clean...
A Groen kettle can braise that meat, simmer a great sauce and boil three kinds of pasta, with
fewer pans and less pan and utensil washing. And less burn-on means less pot scrubbing.
Kettles Cook Faster & Use Less Energy!
HEATING TIME ENERGY USED
IN MINUTES KWH
70
60
50
40
30
20
10
35Kg OF 18°C WATER TO 100°C
(MIN)
180% LONGER 42% MORE ENERGY
FASTER
SAVE ££
7
6
5
4
3
2
1
(KWH)
GROEN
TDB/7-40
KETTLE
GROEN
TDB/7-40
KETTLE
(2) 20 QUART STOCK POTS
ON RANGE TOP SECTION
(2) 20 QUART STOCK POTS
ON RANGE TOP SECTION
Whensteamentersthatjacketspacefromabuilt-insteamgenerator,itisaself-containedkettle.
Whensteamispipedinfromaremoteboiler,itiscalledadirectsteamkettle.
Efficient Steam Heat Transfer... Whensteamentersthejacket,itexpandstofilltheentire
spaceandtransfersitsenergyloadtotheinnerkettlewallandthenintothewaterorfoodbeing
heated.Heatistransferreduniformlythroughtheentirejacketedhemispheresurfacearea.There
arenohotspotsortemperaturevariations.
The Steam Pressure/Temperature Relationship... Atatmosphericpressure,steamis
100°C.Underpressure,waterboilsandconvertsintosteamattemperaturesabove100°C.
Forexample,at3.5bar,steamis148°C.Theratedmaximumsteampressureofkettlesvariesby
type,buttypicallyis1.5-3.45barandhigheronfoodprocessingandsomecook-chillproduction
kettles.Thisrelationshipbetweenpressureandsteamisimportantifmorerapidheatingor
browning(caramelizationofsugars)isrequiredinasteamkettle.Thenkettlemodelswithhigher
ratedpressuresshouldbeconsidered.
How do Steam Jacketed Kettles Work?
See page 14 for Kettle sizing and options.
