Hot Tub Forum

Original => Hot Tub Forum => Topic started by: Alicatt on March 07, 2017, 08:44:36 am

Title: Expected rate of heating?
Post by: Alicatt on March 07, 2017, 08:44:36 am
I'm back from a break back home in Scotland and back to sorting out my tub :)

Today has been the first day that I have let the tub run for any length of time. The water in the tub was 5°c (41°f) at the start and after an hour it was just touching the 10°c (50°f) mark on the thermometer.
For a 3kW heater heating 1700l (449gallonsUS) of water is that good bad or indifferent?

Thanks
Alistair
Title: Re: Expected rate of heating?
Post by: bud16415 on March 07, 2017, 09:37:58 am
Sounds about the same rate of climb as my tub that is a similar size. You could do the math / physics if you want.
Title: Re: Expected rate of heating?
Post by: Alicatt on March 09, 2017, 01:35:34 pm
Thanks,
I let it warm up to 24°c and then switched it off, left it off all day yesterday as I was not feeling well and spent most of the day in bed. This morning I went out and checked the temp and it was at 20°c, I have all the sides off the tub just now as I'm stripping the varnish off, yesterday it was really quite bad weather with rain and a cold wind, so the temp hold was not too bad but I am going to enhance the insulation anyway.

This morning I turned the tub on again and it is now sitting at 36°c and should be warm enough for our first splash this evening, we have a clear sky and a big bright moon so I'm looking forward to it :)
Title: Re: Expected rate of heating?
Post by: Alicatt on March 09, 2017, 04:58:40 pm
Tub was 40°c when we went in, we tried out each of the positions: 5 sit and 1 lounge and they all hit different spots.

Putting on the heater with all the jets would be more than the wiring could handle so it was switched off while we were in, over the hour and a half the temp dropped by 4°c to 36°c, you could feel the diffrence.

It is a big success with the wife, she was not really in favour of it, but by the end it was difficult to get her out of the tub :D

So far it has been well worth the money spent on it ... so far less than €100 :)
Title: Re: Expected rate of heating?
Post by: bud16415 on March 10, 2017, 07:28:55 am
Something I have noticed with our tub and heat loss. If it is a cold winter night and we have the tub set to 103F and we get in for a normal 20-30 minute soak the temp stays pretty constant and at the 20 minute point your body has soaked in enough heat and people will start moving to higher seating to lose a little heat. Around that time people will say I’m good and get out even. The tub has done its job. Now other times we get in with friends or like you did want to stay in for an hour or more and after that first 20 minutes people reaching their limit don’t mind a gradual cooling of the water. If it drops to 102.5 after 30 minutes and to 102 after an hour that is more or less perfect as it allows you to stay in longer and keep enjoying.

What you will find with a tub 1F degree is a big change in temp compared to 1 degree in air temp.

Glad your wife is enjoying.  ;D 
Title: Re: Expected rate of heating?
Post by: Alicatt on March 10, 2017, 02:18:22 pm
That sounds reasonable,

This morning the top of the water was at 32c and the footwell was at 18c so today was spent stuffing insulation in and around the tub while still allowing free space for the pump motors. I lined the walls with foilbacked polystyrene and then put 50mm insulation around the base and frame then stuffed the spaces left with rockwool that I had stuffed in plastic bags, I'll see how that helps. I was not going to bother with insulating the tub until I found out if the wife liked it or not. but as she does then it's full stuff ahead.

Now I have to sort out one jet that didn't work, I can turn it on and off but no water comes out of it, I havn't packed that part with insulation yet, 
Title: Re: Expected rate of heating?
Post by: tlippy on March 14, 2017, 11:48:04 am
to 103F and we get in for a normal 20-30 minute soak the temp stays pretty constant and at the 20 minute point your body has soaked in enough heat and people will start moving to higher seating to lose a little heat. Around that time people will say I’m good and get out even.  If it drops to 102.5 after 30 minutes and to 102 after an hour that is more or less perfect as it allows you to stay in longer and keep enjoying.

I am keeping mine at 100°F.  The outside temp has been 50°F.  Have never cranked mine above the 100°F mark.   For me, 100°F is comfortable.  I stay in, with the air jets on and the pump on HIGH until the pump goes to LOW which is 15 minutes.  I usually stay in another 15 minutes - at least till I finish my 2nd drink.  I have been wondering what temp most people enjoy. Maybe some will comment?
Title: Re: Expected rate of heating?
Post by: bud16415 on March 14, 2017, 11:59:02 am
to 103F and we get in for a normal 20-30 minute soak the temp stays pretty constant and at the 20 minute point your body has soaked in enough heat and people will start moving to higher seating to lose a little heat. Around that time people will say I’m good and get out even.  If it drops to 102.5 after 30 minutes and to 102 after an hour that is more or less perfect as it allows you to stay in longer and keep enjoying.

I am keeping mine at 100°F.  The outside temp has been 50°F.  Have never cranked mine above the 100°F mark.   For me, 100°F is comfortable.  I stay in, with the air jets on and the pump on HIGH until the pump goes to LOW which is 15 minutes.  I usually stay in another 15 minutes - at least till I finish my 2nd drink.  I have been wondering what temp most people enjoy. Maybe some will comment?


The temp of the water is totally related to the outside air temp. like you when it is 50f out 100f water temp is great. In the summer our tub has a mode we use where the heat stays off all day and comes on for evening. We use the tub to cool down when it is in the 80’s or 90’s. On the other hand when it is zero or -10f you would freeze in a 100f tub this winter we had a couple sub zero nights where 103 was not warm enough and 104 was right. The part of your body out of the water the outside temp and wind speed all play a part.
Title: Re: Expected rate of heating?
Post by: tlippy on March 14, 2017, 12:05:46 pm
Do U keep the air on during the winter and turn off during the summer?  My guy says that leaving he air on all jets during winter sucks the warm air generated by the pump and saves energy.  During the summer turn off the air to keep the tub from getting too warm.
Title: Re: Expected rate of heating?
Post by: bud16415 on March 14, 2017, 07:03:16 pm
Do U keep the air on during the winter and turn off during the summer?  My guy says that leaving he air on all jets during winter sucks the warm air generated by the pump and saves energy.  During the summer turn off the air to keep the tub from getting too warm.

We have the air on or off to taste / feel all year. I don’t think you will get enough extra heat off the motors and pumps to notice.
Title: Re: Expected rate of heating?
Post by: icenogle on March 14, 2017, 09:31:20 pm
I like 102.  The wife likes 100.  This is here in Seattle.  I plan on retiring in the Las Vegas area in 6 yrs and 1 month.  Wondering if we will still like those temps during summer in Vegas. Do plan on having a hot tub down there.
Title: Re: Expected rate of heating?
Post by: Tman122 on March 15, 2017, 07:29:14 am
Do U keep the air on during the winter and turn off during the summer?  My guy says that leaving he air on all jets during winter sucks the warm air generated by the pump and saves energy.  During the summer turn off the air to keep the tub from getting too warm.

The problem with this logic is the warm air inside your cabinet is put in the water in the first few seconds. Once that "warm air" is used up, again the first few seconds, then it's outside air being put in the water as the warm air drawn from the cabinet is replaced with cold outside air.
Title: Re: Expected rate of heating?
Post by: Alicatt on March 16, 2017, 01:08:32 pm
I had to turn on the air to help reduce the temperature in the tub quicker when my youngest son tried it for the first time, it was at 102f when we went in but he said it was far too hot and wasn't comfortable until it got down to around 97f (my thermometer is in c not f) but still he was in and out the tub to try and cool off, it wasn't a warm night and we stayed in the tub for about an hour.

Earlier in the week I had got the tub up to 41c or 105f it was starting to get a bit warm for me then, and the wife point blank said she wasn't a lobster :D
Title: Re: Expected rate of heating?
Post by: Tubby on May 18, 2017, 02:45:02 am

Unfortunately, soaking in hot water for extended periods can be unhealthy for certain risk groups like elderly, very young, diabetic, etc.  (and probably all people if it's too hot, or if you're in for too long).  Your organs start to "cook".   To keep it safer, try it at 98F (36.67 C).  That keeps it at, or a touch below, natural body temperature.   It should feel plenty warm when you get in, especially compared to the surrounding air.   It's the jetting of the water that really massages the muscles. 

Tubby

 
Title: Re: Expected rate of heating?
Post by: bud16415 on May 18, 2017, 08:56:00 am

Unfortunately, soaking in hot water for extended periods can be unhealthy for certain risk groups like elderly, very young, diabetic, etc.  (and probably all people if it's too hot, or if you're in for too long).  Your organs start to "cook".   To keep it safer, try it at 98F (36.67 C).  That keeps it at, or a touch below, natural body temperature.   It should feel plenty warm when you get in, especially compared to the surrounding air.   It's the jetting of the water that really massages the muscles. 

Tubby


Tubby

I can tell you first hand that if my tub was set to 98f and the outside temp was zero you would be freezing cold within minutes. The outside temp plays a big role in what the water temp should be because all your body is not under water. The blood supply regulates your core temp by warming what is out of the water and cooling what is in the water.

In the summer we use the setting where the tub stays shut off all day. When it is quite hot outside cooler water is perfect. On a nice summer night 98/99 is very nice, but at -10 I want my tub at 103/104 and nothing is getting cooked.

I do agree children are a whole different story as are elderly on some meds. It is good advice to contact your doctor for advice before doing any hot soaking.
Title: Re: Expected rate of heating?
Post by: Tubby on May 18, 2017, 01:24:10 pm

Unfortunately, soaking in hot water for extended periods can be unhealthy for certain risk groups like elderly, very young, diabetic, etc.  (and probably all people if it's too hot, or if you're in for too long).  Your organs start to "cook".   To keep it safer, try it at 98F (36.67 C).  That keeps it at, or a touch below, natural body temperature.   It should feel plenty warm when you get in, especially compared to the surrounding air.   It's the jetting of the water that really massages the muscles. 

Tubby


Tubby

I can tell you first hand that if my tub was set to 98f and the outside temp was zero you would be freezing cold within minutes. The outside temp plays a big role in what the water temp should be because all your body is not under water. The blood supply regulates your core temp by warming what is out of the water and cooling what is in the water.

In the summer we use the setting where the tub stays shut off all day. When it is quite hot outside cooler water is perfect. On a nice summer night 98/99 is very nice, but at -10 I want my tub at 103/104 and nothing is getting cooked.

I do agree children are a whole different story as are elderly on some meds. It is good advice to contact your doctor for advice before doing any hot soaking.


Thanks bud16415.  - I did preface by saying it "can be unhealthy for certain risk groups."     Most of the body is submerged when in the tub, so most is getting the heat.   I'm going to stay with my doctor's advice and enjoy a nice 98.   Maybe 99 if I feel wild and crazy.   ;D 

Tubby



Title: Re: Expected rate of heating?
Post by: bud16415 on May 18, 2017, 02:10:34 pm

Unfortunately, soaking in hot water for extended periods can be unhealthy for certain risk groups like elderly, very young, diabetic, etc.  (and probably all people if it's too hot, or if you're in for too long).  Your organs start to "cook".   To keep it safer, try it at 98F (36.67 C).  That keeps it at, or a touch below, natural body temperature.   It should feel plenty warm when you get in, especially compared to the surrounding air.   It's the jetting of the water that really massages the muscles. 

Tubby


Tubby

I can tell you first hand that if my tub was set to 98f and the outside temp was zero you would be freezing cold within minutes. The outside temp plays a big role in what the water temp should be because all your body is not under water. The blood supply regulates your core temp by warming what is out of the water and cooling what is in the water.

In the summer we use the setting where the tub stays shut off all day. When it is quite hot outside cooler water is perfect. On a nice summer night 98/99 is very nice, but at -10 I want my tub at 103/104 and nothing is getting cooked.

I do agree children are a whole different story as are elderly on some meds. It is good advice to contact your doctor for advice before doing any hot soaking.


Thanks bud16415.  - I did preface by saying it "can be unhealthy for certain risk groups."     Most of the body is submerged when in the tub, so most is getting the heat.   I'm going to stay with my doctor's advice and enjoy a nice 98.   Maybe 99 if I feel wild and crazy.   ;D 

Tubby


I do agree to test out your likes slowly and get used to your tub. I had a “friend” coworker that bought a tub many years before me. He filled it up and set it on 105 (bragging) and grabbed a six-pack of beer and jumped in he said to read the instruction book. When he got to the part about it is not wise to drink alcohol in the tub he threw the book away.

You will find what works best for you and how to regulate how warm you are by what seat you sit in and how much of you is in the water. Our tub has a cool down seat and it gets used a lot where your upper body is mostly above the water line. You cool down quickly in the winter months. One seat we have has you neck deep as does the recliner. The other corner and the two middle seats you can rest your arms on the top of the tub if you get hot. Most tubs are similar. You always have the option of sitting on the top edge also if you feel like cooling down.

There is no doubt it raises your core temp though because going outside to get in during the winter is do it as quick as you can. But getting out isn’t a problem at all and I often treat the tub and close it up before drying off even.

I have read if you tub after an aerobic workout the tub will keep the aerobic effect going without exercise.

I have a feeling if you live up north you might get crazy around feb and go for 100f.   Enjoy your new tub that’s what counts.
Title: Re: Expected rate of heating?
Post by: Tubby on May 18, 2017, 04:42:52 pm

Hopefully your co-worker friend doesn't still do 105, especially while drinking.  We were staying a Bed & Breakfast where one of the guests drank a lot that night, and then went in the very hot hot tub.  He died from a massive heart attack that night.  Not someone we knew, so we don't know his medical history, but the Innkeeper relayed the info from the medical examiner that said that the alcohol combined with the excessive heat were contributing factors.  Bottom line, get a doctor's clearance before using hot tubs, especially if you like them really hot. 

Tubby   
Title: Re: Expected rate of heating?
Post by: bud16415 on May 19, 2017, 07:15:35 am

Hopefully your co-worker friend doesn't still do 105, especially while drinking.  We were staying a Bed & Breakfast where one of the guests drank a lot that night, and then went in the very hot hot tub.  He died from a massive heart attack that night.  Not someone we knew, so we don't know his medical history, but the Innkeeper relayed the info from the medical examiner that said that the alcohol combined with the excessive heat were contributing factors.  Bottom line, get a doctor's clearance before using hot tubs, especially if you like them really hot. 

Tubby

This old friend no longer hot tubs at 105 or drinks as a few years ago he assumed room temperature. I don’t think it was hot tub related. 

It is fullhearted to be careless with health risks and I don’t see it often mentioned on the forums. Everyone should be aware of the risks stressing your body with extreme temps both hot and cold can have. The big trick to enjoying hot tubbing I think is in self-monitoring your body. We are very used to our tub now and we seem to be about one degree F different in our ideal setting. I sometime wish the tub had half degree steps. When we have friends in the tub I watch them very closely and as soon as I hear them say anything like they are getting overheated or dizzy or any sign of heat related problems I have them move to the cool down seat and if that doesn’t work I have them get out for a bit. Even agile young people that had no problem getting in and out of the tub should be watched or helped out if they are feeling the heat.

At a friend’s tub many years before we had ours we were in the tub and there was another young healthy woman in the tub and she just kind of collapsed. I got her out and in the house and had her cool down and drink water and she came around in a few minutes. Then I find out she took some cold meds and also had a couple drinks. What a recipe for disaster that was. People don’t use good judgment that’s for sure.

We like spending time in our tub and a very hot, hot tub is going to be one you are in and out of in 10-15 minutes. Going one degree cooler makes a world of difference in how much time you can spend in there. Like I said in the hot summer months ours shuts off all day and warms up in the evening. The day hours when the water is 90F are perfect for the kids to play in it like a pool and 99-100 makes for a nice warm evening soak for the adults. In the winter we rarely go higher than 103.

For winter tubbing some warm caps for the head are nice to have. We bought a basket full of them last spring when Wally Mart had them on sale for 50 cents a cap and keep them next to the stack of warm thick towels.   
Title: Re: Expected rate of heating?
Post by: BoxieBoy on May 21, 2017, 05:40:51 pm
We had a guest, who fainted when she got out due to the hot tub affecting her blood pressure. My tub was set to 38 deg C - So you do have to be careful on how long you spend in it, temperature and not to drink too much alcohol  :-\