Reddit mentions: The best hot water bottles
We found 50 Reddit comments discussing the best hot water bottles. We ran sentiment analysis on each of these comments to determine how redditors feel about different products. We found 31 products and ranked them based on the amount of positive reactions they received. Here are the top 20.
1. Attmu Classic Rubber Transparent Hot Water Bottle 2 Liter with Knit Cover - Blue
- Multi Functional Hot Water Bottle - Thermoplastic material that is recyclable. Advanced thermoplastic holds heat longer than traditional hot water bottles with cover, also works as an ice pack, or cold water bottle. But please Caution: The hot water bottle rubber is not suitable for Microwave oven heating.
- Easy To Use - Wide mouth is easy to fill and the anti spurt lip of hot water bottle with cover prevent water spitting back out like those old rubber ones. Fill only to two-thirds capacity maximum. It's transparent. No more guesswork about how much hot water is inside.
- Helpful Assistant - The classic design of this classic hot water bottle. Treating sore muscles, stress or cramps, arthritis, aches and pains, stiff necks, lower back pain, Gifts for women menstrual cramps and other common aches and and can also double up as a cold compress for person with fever or to reduce swelling for minor injuries. Good mothers day gifts for mom.
- Care Instruction - Grid texture makes skin contact safer and more comfortable. Comes with an elegant knitted hot water bag cover to prevent the hot rubber from being in direct contact with your skin to cause burns, plus it has a more classy and personalized look. The hot water bottle rubber should be replaced after two years of use. And check stopper for wear and tear damage at regular intervals.
- After-sale Service - We are so confident with the quality of our hot water bag. But if you don't completely satisfied with botella de agua caliente for any reason, please feel free to ask us at any time!
Features:
Specs:
Color | Blue |
Height | 0.7 Inches |
Length | 5 Inches |
Weight | 0.66 Pounds |
Width | 5 Inches |
Size | 67.63 Fl Oz (Pack of 1) |
Number of items | 1 |
2. HomeTop Premium Classic Rubber Hot Water Bottle w/Cute Knit Cover (2 Liter, Purple)
- Package included: 1 Rubber Hot Water Bottle, 1 Cute Knit Cover
- This hot water bottle is manufactured to B.S.1970:2012 to ensure maximum safety.
- It is made from natural rubber. Retains heat for an extra long time. Ribbed outer surface helps maintain liquid temperature
- Hot water bag helps to relax your tired muscles and tensed shoulders from stress and too much workout.
- A soft and cuddly knit cover, Machine Washable. Turtleneck Knit Style makes it easy to put on bottle. Dimensions: 13" x 8"
Features:
Specs:
Color | Purple |
Height | 3 Inches |
Length | 14 Inches |
Weight | 0.8 Pounds |
Width | 9 Inches |
Size | 67.63 Fl Oz (Pack of 1) |
Number of items | 1 |
3. 10''x7'' RUBBER HOT WATER BOTTLE (Colors may vary)
Has A Tab With A Hanging Hole At The Bottom For DrainingRubber Helps Hold In The Heat LongerColor May Vary between Blue and RedSize : 7.25" X 13.5"
Specs:
4. Deluxe Hot Water Bottle Kit
2-quart hot and cold water bottleWide spout is easy to fillHot water enema bag includes stopper and douche/enema tubingRubber14 1/4" x 73/4" x 2 1/2"
Specs:
Color | Red |
Height | 2.5 Inches |
Length | 14.25 Inches |
Weight | 0.8125 Pounds |
Width | 7.75 Inches |
Size | One Size Fits All |
Number of items | 1 |
5. Japanese Hot Water Bottle [Yutanpo Japan Import] Size L
- Color Orenge
- Material polyethylene
- with a cover
Features:
Specs:
Color | Orenge |
Height | 4.33 Inches |
Length | 11.02 Inches |
Weight | 1.06 Pounds |
Width | 8.86 Inches |
Size | 1 Count (Pack of 1) |
Number of items | 1 |
6. Relief Pak Hot Water Bottle, 2 quart Capacity
- Relieve Body Aches And Pains - If You Are Suffering From Muscle Soreness Or Body Aches Try Using A Hot Water Bottle. Simply Fill It Up With Hot Water And Place It Anywhere Relief Is Needed. Heat Can Ease A Range Of Pains From Headaches To Cramps
- Use For Soothng Heat Therapy - Fill The Bottle With Warm Water To Ease Aches And Pains From Headaches, Cramps, Arthritis, Toothaches, Sore Muscles And More. If You Feel Chilly On A Cold Night, A Hot Water Bottle Is Great To Use As A Bed Warmer
- Great For Everyone - Anyone Can Benefit From Using A Hot Water Bottle From Athletes To Everyday People Both Young And Old. Athletes Can Use It For Muscle Recovery And Sports Injuries While Everyday People Can Use It To Relieve Minor Aches And Pains
- Easy To Use - Using A Rubber Water Bottle Is Simple. Just Unscrew The Top Of The Bottle, Fill It 2/3Rds Full With Warm Water, And Screw On The Cap. The Water Will Remain In The Bottle And Maintain Its Liquid Temperature
Features:
Specs:
Color | red |
Height | 1.99999999796 Inches |
Length | 7.99999999184 Inches |
Weight | 0.6393405598 Pounds |
Width | 11.99999998776 Inches |
Size | Single |
Number of items | 1 |
7. Carex Hot Water Bottle With Cover, Rubber - Heat Therapy and Cold Therapy - For Cramps, Pain Relief, Arthritis, Aches and Pains
HOT WATER BOTTLE: With a soft fleece cover this hot water bottle with cover offers comforting warmth for warming up cold hands & feet adding warmth to your bed & relieving pain like sore muscles, menstrual cramps or joint pain from arthritis.RELIEVE YOUR PAIN: Heat therapy especially moist heat can ...
Specs:
Color | Blue |
Height | 12.5 Inches |
Length | 2 Inches |
Weight | 0.9 Pounds |
Width | 8 Inches |
Size | 2 Piece Set |
8. Hot Water Bottle Cover : (Pack of 2 Covers)
Great For Nursing Aches And PainsSoft, Fluffy Fabric Is Comfortable On The SkinColor May Vary
Specs:
Weight | 0.5 Pounds |
9. Fashy 2.0 Litre Antrazite Plain Hot Water Bottle
- Thermoplastic hot water bottle
- Colour: anthrazit
- Made in Germany
- Integrally moulded hot water bottle with jointless neck preventing leakages
- Material odourless and recycable
Features:
Specs:
Height | 2.362204722 Inches |
Length | 12.598425184 Inches |
Weight | 0.661386786 Pounds |
Width | 7.480314953 Inches |
Size | 1 Count (Pack of 1) |
Number of items | 1 |
10. HomeTop Premium Classic Rubber Hot Water Bottle, Great for Pain Relief, Hot and Cold Therapy (2 Liters, Red)
GREAT FOR PAIN RELIEF, HOT & COLD THERAPY - Hot water bottle can be used alone as a remedy for aches, pains and sports injuries. In addition to the traditional hot therapy, it can also double up as a cold compress for kids with fever or to reduce swelling for minor injuries.CONTINUOUS WARM - It is m...
Specs:
Color | Red |
Size | 67.63 Fl Oz (Pack of 1) |
Number of items | 1 |
11. SteadMax Hot Water Bottle, Natural Rubber -Bpa Free- Durable Hot Water Bag for hot Compress & Heat Therapy, Blue Color (1 Pack)
6 Hot water bottles, ships in random colorsMeasures 14 x 7 inch, hot water container 10 x 7 inchHeavy duty hot water bottle bag, durable and long lastingRibbed outer surface for safer skin contact and longer heat retainingMade of natural rubber, Non toxic, BPA & Phthalates free, natural Rubber may s...
12. Country Club Ashley Housewares 2L Hot Water Bottle
- Conforms to British Standard 1970:2006
- Natural Rubber Material
- Ribbed for Comfort
- Approx. Size 34cm x 20cm (13" x 8")
- 2 Litre Capacity (Approx.) - Colours may vary.
Features:
Specs:
13. Perineal Lavette Irrigation Bottle, (Pack of 5)
8 Ounces -Perineal Lavette Bottle-(5-PACK)
14. Transparent Classic Hot Water Bottle - Made in Germany
- Holds the heat longer than traditional rubber bottles
- Thermoplastic material that is odorless and recyclable
- Can be used hot or cold
- Cross-hatched design provides intense heat
- Made in Germany
Features:
Specs:
Color | Clear |
Size | 1 Count (Pack of 1) |
Number of items | 1 |
15. Old Glory - Pac-man - Game Over Water Bottle
Specs:
Color | Multi-colored |
Height | 4 Inches |
Length | 4 Inches |
Weight | 0.5 Pounds |
Width | 8 Inches |
Size | 8" |
Number of items | 1 |
16. Microwave Heating Hot Water Bottle for winter-520ml Portable hot Water Bag for Pain Relief Silicone Hand Warmer with Knit Cover(Long, Pink)
- High quality & Safe:It is made of food grade silicone, odorless,recyclable and durable.Integral molding process ensure leak-proof, explosion-proof.Wide mouth design, easy to fill up water.
- Multifunctional: 1. Fill with cold water and put it in refrigerator to make an ice bag,the ice bag can be used as a cold compress for pains, sports injuries, fever and reduce swelling. 2.Take off the knit cover and fill in cold water then heated in microwave oven to make a hot water bag, it can help to resist the cold(the heating time is should be less than 3 minutes and the heating power should be not over 1500W)
- Knit Cover: The soft knit cover can prevent the hot surface from being in direct contact with your skin to cause burns.
- Beautiful gift packaging:The silicone water bag and knit cover were packed in a gift box, and it is good gift to your family and friends for Festivals.It can bring you warm in cold days.
- Two kinds of lids meet different needs,screw lid is easy to handle, and ring-pull is very convenient to carry.
Features:
Specs:
Color | Pink |
Size | 17.58 Fl Oz (Pack of 1) |
17. Attmu Classic Rubber Transparent Hot Water Bottle 2 Liter with Knit Cover - Red
- Multi Functional Hot Water Bottle - Thermoplastic material that is recyclable. Advanced thermoplastic holds heat longer than traditional hot water bottles with cover, also works as an ice pack, or cold water bottle. But please Caution: The hot water bottle rubber is not suitable for Microwave oven heating.
- Easy To Use - Wide mouth is easy to fill and the anti spurt lip of hot water bottle with cover prevent water spitting back out like those old rubber ones. Fill only to two-thirds capacity maximum. It's transparent. No more guesswork about how much hot water is inside.
- Helpful Assistant - The classic design of this classic hot water bag for pain relief. Treating sore muscles, stress or cramps, arthritis, aches and pains, stiff necks, lower back pain, valentine's day gifts for her menstrual cramps and other common aches and and can also double up as a cold compress for kids with fever or to reduce swelling for minor injuries.
- Care Instruction - Grid texture makes skin contact safer and more comfortable. Comes with an elegant knitted hot water bag cover to prevent the hot rubber from being in direct contact with your skin to cause burns, plus it has a more classy and personalized look. The hot water bottle rubber should be replaced after two years of use. And check stopper for wear and tear damage at regular intervals.
- After-sale Service - We are so confident with the quality of our hot water bag. But if you don't completely satisfied with botella de agua caliente for any reason, please feel free to ask us at any time!
Features:
Specs:
Color | Red |
Height | 1 Inches |
Length | 12 Inches |
Weight | 0.000625 Pounds |
Width | 8 Inches |
Size | 67.63 Fl Oz (Pack of 1) |
18. Warmies Plush Heat Up Microwavable Soft Cuddly Toys With A Lavender Scent, Giraffe
Simple To Use - Just Warm In A MicrowaveCan Be Reheated Thousands Of TimesSurface Clean With A Damp SpongeScented With French LavenderSoft & Comfortable
Specs:
Height | 9.448818888 Inches |
Length | 3.149606296 Inches |
Width | 6.692913379 Inches |
Size | 1 Count (Pack of 1) |
Number of items | 1 |
19. Hot Water Bottle with Knit Cover, UBEGOOD Rubber Transparent Hot Water Bag, Good for Pain Relief (2 Liters, Blue/Gray)
- ◆SAFE & NO LEAK: Made of premium soft Thermoplastic material, non-toxic, odorless and recyclable. Make sure maximum safety and transfer the heat well. With tested, no risking of leakage and explosion.
- ◆Holds Heat Longer: Grid texture surface retains heat longer than traditional rubber bottles. Non-slip and anti-scalding, with soft and elegant knit cover, prevent in direct contact with your skin to cause burns and keep warm longer.
- ◆Pain Relief: Hot water bag could be used to warm whole body, treat sore muscles, stiff necks, lower back pain, menstrual cramps, arthritis,stress or cramps, also as a cold compress for kids with fever or to reduce swelling for minor injuries.
- ◆Easy to Use : Wide mouth is easy to fill hot water and the anti spurt lip prevent water spitting back out like those old rubber ones. Fill only to 2/3 capacity maximum. It is transparent, easy to fill water to the suitable capacity.
- ◆UBEGOOD Service: Every customer would be provided 24h online and friendly customer service for all of our products. Any problem, feel freely to contact us. We will glad to help you.
Features:
Specs:
Color | Blue+gray |
Size | 67.63 Fl Oz (Pack of 1) |
Number of items | 1 |
20. Optima Hot Water Bottle
- 55% RUBBER HOT WATER BOTTLE, BOTTON SEALING TECHNOLOGY - NO WATER LEAKAGE
- Used as a natural body warmer Used for heat therapy treatment 2 liter hot water bottle.
- Portable and effective with instant heat Bottom Sealing Technology
- 2 LITRE CONTENT, PLASTIC CAP AND COPPER RING, BODY WARMER USED FOR HEAT THERAPY TREATMENT
Features:
Specs:
Weight | 0.61729429329063 Pounds |
🎓 Reddit experts on hot water bottles
The comments and opinions expressed on this page are written exclusively by redditors. To provide you with the most relevant data, we sourced opinions from the most knowledgeable Reddit users based the total number of upvotes and downvotes received across comments on subreddits where hot water bottles are discussed. For your reference and for the sake of transparency, here are the specialists whose opinions mattered the most in our ranking.
It was a 2018 gift, but this cute hot water bottle. My feet are freezing most of the year but fall/winter especially. I can't sleep if my feet are cold so my husband bought me this. I fill this with hot water when I shower at night, pop it at the foot of the bed, and it makes sleeping SO much more comfortable.
Plus the cover is super cute and keeps things from getting too hot. :)
Something other people haven't mentioned yet is a hot water bottle! I think they're more common in the UK than the US but you can find them on amazon ( this for example)and then buy a nice hot water bottle cover (like this).
Give it to her before she gets her period and she'll still love it, but she'll probably discover soon that it feels super nice against her stomach when she has cramps.
Congratulations! I hope your surgery goes well. It looks like your husband is doing fantastic.
I have had this on my WL for ages. I have a bad back and I've heard that a hot water bottle is much better for your back than an electric heating pad.
The best thing that has happened to me lately is that I finished shopping for school supplies for my oldest daughter. I loathe school supply shopping right before school, so I went out and did it this evening and it was so much fun. Just like being a kid again. Well, at least if you were that weird kid that really loved shopping for school supplies. I was.
a whole new you
I'm in a similar situation OP. A wet washcloth on your neck is great, but here is my best tip for sleeping. Get a hot water bottle (smooth kind, not the kind with ridges), except fill it with cold water. Sandwich it between your thighs. This cools down the blood passing through your femoral arteries pretty quick. Works great. You could even add some of those long, skinny ice cubes meant for a water bottle.
Here is the water bottle I use - highly recommended.
This: https://www.amazon.com/Japanese-Water-Bottle-Yutanpo-Japan/dp/B000BSC7F2
Best thing I've bought when I get too cold, but it's not cold enough overall to justify turning the furnace on. I've even used it to plant my feet on when it's pretty warm, and it cools me off (with cool water on the inside).
Also my cat is fond of it when it has hot water inside and will cuddle up to it (and me :D )
Amazon has great water bottles listed. Some even come with nice warm covers. I bought this for myself and extra for family and we all love it.
I wonder if OP could also offer to text the owners whenever the cat comes over for the night? It probably wouldn't wake them up, but when they got up in the morning they'd be able to see right away that their cat was safe. If the neighbors don't text, perhaps he could leave a little sign outside his door or something to indicate the cat was there.
Or like you say, a little cat house with blankets is a nice idea. Maybe also a hot water bottle or thermos or something to keep it warmer?
Just a heads up, Midol is overpriced - generic acetaminophen and a warm drink will be just as helpful to you in your discomfort. Those heating pads are also a bit pointless and expensive, a hot water bottle like this will last you many years and does exactly the same job!
I'd also suggest some kind of reusable feminine care option to save you money in the future - a Diva cup, perhaps, or cloth pads. I use cloth pads, and have never had the desire to go back to disposables. I understand if you're not comfortable with those though, it's just a suggestion.
I know someone else suggested an Amazon wishlist, I encourage you to do this (when you can get it to work).
Edit: If don't don't get any help here, try /r/RandomKindness as well.
We bought some old school hot water bottles like these and, for the kids, fill them up with the hottest water from the tap. I usually put them near baby’s feet, just so there’s some ambient warmth nearby. They retain heat really well and the little sweater sleeves prevent them from being too hot to the touch. You could even just put it in the bed before bedtime and take it out when you lay baby down. We have one for every bed in our house and sometimes my five year old falls asleep hugging his like a stuffed animal!
I live in Canada, here is what I've done:
Put boiling water in hot water bag[1] and put the bag near your core/on your lap. You can put your hands on the bag between rounds but, really, by warming your core your hands will no longer get cold.
All other tips still apply: Wear slippers, wear a sweater, drink soup. That stuff helps. But hands down (hah) having a hot water bag will heat your core up like nothing else and your hands will naturally be taken care of.
[1] http://www.amazon.ca/Ashley-Housewares-Hot-Water-Bottle/dp/B004FR20TS
Perineal Lavette Irrigation Bottle, (Pack of 5) https://www.amazon.com/dp/B07B9N45Y7/ref=cm_sw_r_cp_api_i_sVwmDb5652W2Q
They don’t look like much but they work really well. The portability is awesome and I was able to have two in my handbag for long airport layovers
I have a hot water bottle that I fill every night about an hour before bed. This is the one I have: http://www.amazon.com/Transparent-Classic-Hot-Water-Bottle/dp/B000MR5RBI/ref=sr_1_4?ie=UTF8&qid=1421280361&sr=8-4&keywords=hot+water+bottle
It gets everything nice and toasty and is actually still warm when I wake up in the morning. I heat an electric kettle with water and it fits about the same amount of water that the hot water bottle uses.
I also use a down comforter, with another one on top. In addition to that, I have two dogs that sleep with me and keep everything nice and toasty.
It's not a pillow, but one of my fav things in the world is a hot water bottle like this: https://www.amazon.com/Premium-Classic-Rubber-Bottle-Purple/dp/B01KSLPKS2/ref=sr_1_8_s_it?s=hpc&ie=UTF8&qid=1518421496&sr=1-8&keywords=hot+water+bottle
It's a soft rubber bottle that you fill with hot water out of a kettle (obvs don't fill it up all the way, just 2/3 full). It fits inside a soft cover and when you hug it, it's just so warm and soothing. Everytime I have period pains or a bellyache this is my go to solution. Or any kind of aches really. Or when I'm sick. This stuff is amazing and so comforting.
The internet community has gotchu!! It's how I cheered myself through my insertion :) I also highly recommend a hot water bottle/bag to rest on your abdomen after the insertion, mine helped allll the cramps and twinges I felt later that day and night!
I have four that are similar to what you want. None of them are exactly the same, but I hope these might be helpful.
I found this:
https://www.amazon.com/Pac-Man-Black-Stainless-Steel-Bottle/dp/B07GC88DVS/ref=mp_s_a_1_2?ie=UTF8&qid=1550094971&sr=8-2&pi=AC_SX236_SY340_FMwebp_QL65&keywords=pacman+thermos&dpPl=1&dpID=41X6cXdC9tL&ref=plSrch
This one:
https://www.amazon.com/Pac-Man-17oz-Stainless-Bottle-Purple/dp/B07D9R9JY8/ref=mp_s_a_1_5?ie=UTF8&qid=1550095082&sr=8-5&pi=AC_SX236_SY340_QL65&keywords=pacman+water+bottle&dpPl=1&dpID=316KKi9S86L&ref=plSrch
This: https://www.amazon.com/gp/aw/d/B00DQBCD5U/ref=mp_s_a_1_8_a_it?ie=UTF8&qid=1550095147&sr=8-8&keywords=pacman+water+bottle&dpPl=1&dpID=41r4ghUeF
This: https://www.ebay.com/itm/Pac-Man-Stainless-Steel-17oz-Water-Bottle-Black/323637039209?hash=item4b5a455069:g:AZEAAOSwtvZcMWHo
Wow that pup went a long time if she slept all night.
We have to get potty break at 11pm and are up ready for play potty and breakfast at 4am with our 12 week old.
A heating pad helped her settle in her crate to sleep when tucked under her blanket.
https://www.amazon.com/dp/B07XN7DCL8/ref=cm_sw_r_cp_apa_i_nXTVDbNKA52X4
this is the one I bought
In the past I’ve used a kettle or hot water from the tap to fill them up. I like having the sleeves on the bottles because you can get the water hotter (they stay warmer longer) and it’s a perfect barrier between the hot thing and your skin!
I have a dinosaur warmie and it’s my absolute favorite!
They have different ones! I linked you the giraffe :)
This sounds weird and very un splurge like, but this hot water bottle is the bomb. Seriously.
If there is any reason that you didn't get it by now, here is your chance. Just think about suffering with cramps or sore muscles and wonder, what could I do to alleviate this horror? Hot water bottle is the answer.
How do i know? I used to have bad cramps when I was younger. I don't anymore, but this seriously helped more than aleve. Also, I had two since I'd get back and lower stomach cramps. Oh, the pleasures of being a girl! (゜´Д`゜)
Edit: Because this iPad spell check is actually a potato. Hilariously, it autocorrects iPad.
Ibuprofen is typically more effective for cramps than acetaminophen, but you can also take both at the same time. Applying heat to your abdomen should help too. I use either a hot water bottle if I'm at home or heating pads if I'm out. The discharge is normal in my experience.
Uhhh... typically when people say hot water bottles they mean like these....
Relief Pak Hot Water Bottle, 2 quart Capacity https://www.amazon.com/dp/B001VJC3ZE/ref=cm_sw_r_cp_api_P9Y6BbJFAG17V
They’ll work much longer, be soft, not burn you if you don’t put in a sock or whatever... it’s what they’re meant for
I manage the heat by charging my phone on a mostly-filled water pouch (something like https://smile.amazon.com/dp/B001VJC3ZE/ ). Water has a high heat capacity so the pouch is enough to keep the phone cool even when quick-charging.
My absolute favorite is this oversized heating pad. It doesn’t get too hot to burn but hot enough to bring down the pain, and turns off after awhile. Full disclosure, I fall asleep with it on the highest setting all the time and have never gotten burned.
Pure Enrichment PureRelief XL Heating Pad for Back Pain and Cramps - Fast-Heating, Ultra-Soft Heat Therapy with 6 Temperature Settings and Auto Shut-Off Feature - 12" x 24" (Charcoal Gray) https://www.amazon.com/dp/B01KVYTV86/ref=cm_sw_r_cp_api_i_kHS1Db0KH64XH
Although, this is another one of my favorite options. For me, the heat from water is much more therapeutic (see my massive water bill for the several hot showers a day I take haha). But this is like an old fashioned rubber hot water bottle. A lot of them come with cute covers on them. You pour hot water in it and it literally lasts the night.
Hot Water Bottle with Knit Cover, UBEGOOD Rubber Transparent Hot Water Bag, Good for Pain Relief (2 Liters, Blue/Gray) https://www.amazon.com/dp/B07K6BMNPX/ref=cm_sw_r_cp_api_i_FJS1DbKPR4BFD
Finally, I personally don’t like this because it is too tight on my belly, but some of my other friends with endo swear by using this at work. It might be more discrete in the workplace.
DOACT Waist Heating Pad for Back Pain, Heat Waist Belt Hot Compress Therapy for Menstrual Abdomen Cramps, Lower Back Pain Relief, 5V Electric Heating Pad for Women Men https://www.amazon.com/dp/B07SR1JRHR/ref=cm_sw_r_cp_api_i_PKS1DbQTMM4CR
/u/_jeth needs this book so she can have it signed by David Sedaris when she sees him speak next week. I've heard that when he signs things he writes hilarious inscriptions. It would be a shame if she missed out on that amazing opportunity.
I don't need double talk, I need this hot water bottle to soothe all my aches and pains.
Take a look at these water bottles, it may give you an extra few hours of warmth and some readily available water to wash up in the morning.
It’s a large, rubber-plastic ‘sack,’ which you fill with hot water. People use it to keep their beds warm, pillows warm, etc.
example
http://www.amazon.in/Optima-HWB-01-OPTIMA-WATER-BOTTLE/dp/B012CNV5EC
yours have ridges like this?
I bought the one below from Amazon, but it looks like it's no longer available.
https://www.amazon.com/dp/B000MR5RBI/ref=cm_sw_r_cp_apa_OSE4ybK1P744K
I got this rubber water heat pad instead of an electric warmer and it is strangely... adorable? https://www.amazon.com/Attmu-Classic-Rubber-Transparent-Bottle/dp/B00Q2A85K4
The sweater kills me. I am debating cutting arm and butt holes so my cat can wear it.
https://www.amazon.ca/Relief-Water-Bottle-quart-Capacity/dp/B001VJC3ZE/ref=asc_df_B001VJC3ZE/?tag=googlemobshop-20&linkCode=df0&hvadid=293004289887&hvpos=1o2&hvnetw=g&hvrand=15658100959337115102&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=1002762&hvtargid=pla-318556315413&psc=1
I just recently ordered this hot water bottle for my wife
Heating pad (or, if you’re old school, a hot water bottle).
Unless you want a ton of condensation inside you'll want to crack a window which means sleeping in 30 degree weather. That's really not cold with a good sleeping bag and the right layers on. Forget about heating the air, get a couple of these if necessary: http://www.amazon.com/Transparent-Classic-Hot-Water-Bottle/dp/B000MR5RBI