Medical knowledge | High school » How to Use the Wood-fired Hot Tub

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How  to  use  the  wood-­fired  hot  tub   COMMON  QUESTIONS   HEALTH  AND  SAFETY   How  many  adults  will  fit   in  the  tub  comfortably?   The  tub  will  accommodate   up  to  6  adults.    It  is  not   suitable  for  children.   How  do  you  control  the   water  temperature?   Bathing  in  water  which  is   hotter  than  40  degrees  can   cause  fainting  (see  article).       Never  bathe  alone  as  there   is  a  risk  of  fainting  after   sitting  in  hot  water.   It  is  important  to  monitor   the  water  temperature  with   the  thermometer  provided   and  adjust  the  fire  with  the   air  intake  regulator.  Once   the  desired  temperature  is   reached,

 close  the  air  intake   and  the  water  temperature   will  not  rise  noticeably.    If   the  water  temperature  gets   above  40  degrees,  add  cold   water  with  the  hose  to   reduce  the  temperature.     How  high  should  I  fill  it   with  water?   Fill  the  tub  to  6”/15cm   from  the  top  (marked)   which  means  the  firebox  is   covered  by  water.    The  tub   must  be  filled  with  water   before  lighting  the  fire.   How  much  fuel  does  the   boiler  require?   On  average,  you  will  need   about  2  bags  of  logs  to  heat   the  water  from  cold.    Build   up  the  fire  steadily  in  2-­‐3   stages  to  a  full  firebox.  

 Use   only  dry  wood  -­‐  not  fresh   sawn  or  wet  wood  as  the   surface  temperature  in  the   firebox  isnt  high  enough  to   burn  off  the  excess  tar.     How  long  does  it  take  to   heat  the  water?   This  varies  from  Summer  to   Winter.    In  Summer,   heating  the  water  from  14C   to  34C  takes  around  1½   hours.    In  Winter,  heating   the  water  from  6C  to  38C   takes  4-­‐6  hours  depending   on  the  size  and  dryness  of   the  wood.   We  recommend  that  you   stir  the  water  occasionally   to  maintain  even  heating.   Is  there  a  danger  of   burning  myself  on  the   firebox?   The  firebox  is  protected

 by   a  fence  and  you  should   make  no  attempt  to  touch  it   when  it  is  lit.  Any  surface   underwater  will  not  be  hot   on  brief  contact,  however   sustained  contact  may   cause  a  burn.   Does  the  flue  get  hot?   The  chimney  (flue)  above   the  cover  board  is  insulated   and  timber-­‐clad  to  avoid   danger  to  users.   How  long  can  I  stay  in  the   hot  tub?   The  ideal  session  is  10-­‐15   minutes.    We  advise  against   staying  in  longer  than  30   minutes  at  a  time.  Drink   plenty  of  water  to  avoid   dehydration,  and  get  out  if   you  feel  at  all  drowsy.  We   advise  against  drinking   alcohol  while

 in  the  tub.   Because  of  the  risk  of   fainting  (and  drowning)  it   is  not  safe  to  bathe  alone.   Please  replace  the  lid  at  the   end  of  each  bathing  session   HOT  TUB  MAINTENANCE   How  frequently  do  I  need   to  change  the  water?   We  recommended  that  you   change  the  water  after  4   close  sessions.  As  no   chemicals  are  added  to  the   water,  bathers  must   shower  before  entering  the   hot  tub.    The  tub  is  purely   for  relaxing  in,  not  for   washing  in.    No  soaps  or   chemicals  may  be  added  to   the  water.   How  do  I  clean  the  ash   out  of  the  firebox?   You  can  reach  in  with  a  

shovel  or  scoop  once  the   embers  are  cold.    Wood   burns  well  on  a  bed  of  its   own  ash  and  so  may  be   used  for  4  -­‐  5  fires  before   emptying.    There  is  no  need   to  completely  empty  the   burner.   How  do  I  empty  the  tub?   Leave  the  water  in  the  tub   at  the  end  of  your  stay  so   that  it  can  be  disinfected   before  emptying.   If  you  need  to  empty  the   water  out  for  any  reason,   pull  up  the  wooden  plug.   next  to  the  air  intake. How  to  use  the  wood-­fired  hot  tub   For  your  comfort  and  safety  please  observe  these  simple  rules:     DOs     • • • • • Fill

 the  tub  with  water  up  to  the  mark  before  lighting  the  fire     Use  dry  wood  and  add  more  wood  in  stages   Stir  the  water  frequently  while  it  is  heating  up   Close  the  air  intake  once  the  desired  temperature  is  reached   Add  more  cold  water  if  the  temperature  rises  above  40C   • • • • Shower  before  each  bathing  session   Drink  water  to  avoid  dehydration   Replace  the  lid  after  each  use   Leave  the  water  in  the  tub  at  the  end  of  your  stay     DONTs     • • • • • • • • • Do  not  light  the  fire  until  the  tub  is  filled  with  water   Do  not  sit  the  firebox  lid  directly  on

 the  wooden  decking   Do  not  use  the  hot  tub  if  you  are  pregnant  or  feeling  unwell   Do  not  use  the  hot  tub  if  the  water  temperature  is  more  than  40C   Do  not  allow  children  in  or  near  the  tub   Do  not  touch  the  burner  underwater  behind  the  wooden  fence   Do  not  use  soaps  or  chemicals   Do  not  drink  alcohol  (or  if  you  do,  only  in  moderation)   Do  not  stay  in  the  water  if  you  feel  drowsy  or  dizzy   • Do  not  sit  candles  on  any  wooden  surface   • Never  bathe  alone!     How  to  use  the  wood-­fired  hot  tub   How  to  use  the  wood-­fired  hot  tub   Filling  the  tub  and

 lighting  the  fire   It  takes  5-­‐8  hours  to  fill  and  heat  the  tub  and  you  will  need  to  be  around  for   much  of  this  time.   1.   As  stated  above,  you  need  to  fill  the  tub  to  the  marked  line,  so  that  water  is   covering  the  firebox.       2.   Once  the  tub  is  filled  with  water,  open  the  firebox  by  lifting  the  wooden   handle.    It  is  a  bit  awkward  but  can  be  manoeuvered  out  at  an  angle       Check  how  much  ash  is  in  the  firebox.    It  is  important  to  make  sure  that  ash   isn’t  blocking  the  bottom  of  the  air  intake  [the  pipe  with  a  swiveling  lid].   If  there

 is  a  small  amount  of  dry  ash  it  is  fine  to  use  this  as  a  base  for  lighting   the  fire.  If  it  is  excessive  then  clear  some  or  all  with  the  scoop     If  there  is  wet  ash  and  water  (as  rain  can  get  in  through  the  chimney)  it  is   best  to  scoop  it  out  into  the  metal  pail  using  the  scoop  provided.     3.   Place  a  firelighter  on  the  bottom  of  the  box  or  on  a  bed  of  tightly  twisted   newspaper.    (If  you  dont  have  a  firelighter  you  can  simply  use  more  tightly   twisted  newspaper.)    Surround  it  with  small  pieces  of  kindling  so  that  you   can  still  reach  it

 with  a  match.   4.   Once  it  is  alight,  add  more  kindling  and  gradually  more  dry  logs  [found   beside  the  cabana].    When  they  are  burning  well  you  can  then  fill  the  firebox   to  the  top  with  wood  and  replace  the  lid  completely.   5.   Check  the  fire  every  30  minutes  and  add  wood  as  necessary  to  keep  the   firebox  full.    Check  the  temperature  each  time,  stirring  the  water  because   the  surface  is  usually  hotter  than  the  bottom!    It  is  surprising  how  quickly   you  can  reach  the  recommended  temperature  (see  above).    Once  you  have   done  this,  close  the  swivel  lid  on  the  air  intake.  

 This  will  dampen  the  fire   (although  the  temperature  may  still  rise).   Any  time  you  open  the  firebox  please  sit  the  handle  on  the  stone  slab  so  as   not  to  burn  the  decking.   6.   After  your  bathing  session  leave  everything  closed    Do  not  drain  the  water       How  to  use  the  wood-­fired  hot  tub       How  to  use  the  wood-­fired  hot  tub   We  want  you  to  enjoy  the  hot  tub  but  we  also  want  you  to  be  safe!     Please  read  this  article  explaining  the  dangers  of  allowing  the  water  to   overheat.     Hotter  Hot  Tub  Water  Poses  Increased  Fainting  Risk   Source:  Mayo  Clinic  

  Hotter  water  in  hot  tubs  poses  increased  health  risks  from   fainting,  Mayo  Clinic  researchers  report.  Mayo  Clinic  heart   researchers  had  six  subjects  soak  in  40C  degree  water  (the   current  recommended  temperature  for  hot  tubs)  and  41.5C   degree  water  for  21  minutes  to  see  if  hotter  water  caused  any  ill   effects.   They  concluded  that  the  higher  temperatures  posed  little  health   risk  from  heart  or  circulation  problems.  But  they  found  that   when  the  subjects  stood  up  to  exit  the  tub,  systolic  blood   pressure  dropped  dramatically,  nearly  twice  as  much  in  the   hotter  water  compared  to  the  40C  degree

 temperature.  The   result  is  less  blood  flow  to  the  brain,  which  can  cause  fainting,   which  in  turn  might  lead  to  injury  by  falling  or  by  drowning.   The  authors  point  out  that  in  an  earlier  study  36  hot  tub  deaths,   25  were  found  to  be  caused  by  drowning.   Thomas  Allison,  Ph.D,  a  cardiovascular  disease  specialist  at   Mayo  Clinic,  says  the  problem  can  be  prevented  by  limiting  time   in  the  hot  tub  to  10-­15  minutes,  by  keeping  the  water   temperature  no  more  than  40C  degrees,  and  by  emerging  slowly   from  the  water.