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  • tvengineer commented on JON-A-TRON's instructable Portable Hot Tub
    Portable Hot Tub

    Very nicely done.. I just realized that this is an old post but I am going to comment anyway.. I have the inflatable tub and I use the exact same pump and almost the same heater.. it works great... to heat the water as fast as possible while recirculating from the tub.. set the heater to the max flow rate and max burn rate.. it is all about putting BTUs into the tub.. not about how hot the water is coming out of the heater. Mine can raise the temperature of 250 gallons of water about 1 degree Fahrenheit every two minutes. So to go from your example of 40F starting water it should not take longer than 2 hours (or a little more) to get up to tub temperature.. no where near the six hours you estimate.. still beautiful job on the construction... oh. and if you are only going to use the …

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    Very nicely done.. I just realized that this is an old post but I am going to comment anyway.. I have the inflatable tub and I use the exact same pump and almost the same heater.. it works great... to heat the water as fast as possible while recirculating from the tub.. set the heater to the max flow rate and max burn rate.. it is all about putting BTUs into the tub.. not about how hot the water is coming out of the heater. Mine can raise the temperature of 250 gallons of water about 1 degree Fahrenheit every two minutes. So to go from your example of 40F starting water it should not take longer than 2 hours (or a little more) to get up to tub temperature.. no where near the six hours you estimate.. still beautiful job on the construction... oh. and if you are only going to use the water for a couple of days at a time I think I would just do away with the filtration.. or look for a cheap kiddy pool filter.. I got a whole set up for a kids pool..pump filter and hoses for about $20 last summer.

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  • Painted Utility Box Public Art/Mural

    In my city, every utility box like this has been painted.. I am sure that they require the artist to use the proper materials and to not cover up any ventilation areas.

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  • Portable Water Heater for a Hot Tub or Pool

    I did it ! With the 10L heater and the same pump.. works great! I have run mine for well over 20 minutes without it shutting down though... maybe mine is defective or does not have the 20 minute time out, I don't know. Also, on mine, the temp display is intermittent... sometimes it works, but mostly it shows wildy wrong temperatures.. I just set it to the max heat setting and let it run until the tub is up to the temperature I want... in the future, I want to build a controller for it so I can have it maintain the tub temperature and maybe even make it remote controllable over the internet.

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  • Portable Water Heater for a Hot Tub or Pool

    Thank you for the reply.... I am looking at a few different ones on Amazon.. I will be using it with the Intex 6 person (yea six little persons) spa.. Yes.. It does not maintain the heat when the bubbles are running.. and this is in the summer.. I imagine when the air is cold those bubbles will cool it down really fast. I like the idea that you let it cool and only heat it with the propane heater.. I don't know how much we would use it in cooler weather... and running the electric heater all the time once the temperature drops will be very expensive.. Knowing I can heat it in a couple of hours from cold means that I can keep it going without breaking the bank. Again thank you for the quick reply.. First thing is for me to build a small deck to put it on (it is in the mud right now) t…

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    Thank you for the reply.... I am looking at a few different ones on Amazon.. I will be using it with the Intex 6 person (yea six little persons) spa.. Yes.. It does not maintain the heat when the bubbles are running.. and this is in the summer.. I imagine when the air is cold those bubbles will cool it down really fast. I like the idea that you let it cool and only heat it with the propane heater.. I don't know how much we would use it in cooler weather... and running the electric heater all the time once the temperature drops will be very expensive.. Knowing I can heat it in a couple of hours from cold means that I can keep it going without breaking the bank. Again thank you for the quick reply.. First thing is for me to build a small deck to put it on (it is in the mud right now) then I will buy the heater. :-)

    Yea... I got taken.. Wife has been wanting one for a couple of years now and we have been putting it off.. I remember the prices a year ago were around $500.. this year our normal beach trip (to a condo with a hot tub) was cut out because of the pandemic and she really wanted to get in a hot tub. I managed to find an Intex tub on Amazon and I paid right about $800 for it (OUCH).. but it is what she wanted and it was about 1/2 of what the beach condo would have cost anyway.

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  • Portable Water Heater for a Hot Tub or Pool

    1 degree every 2-4 minutes.. wow that is fast!.. How do you normally use it? Do you just let the tub cool all the way down and then rapidly heat it with propane when you want to use it? Or, do you keep the tub warm with the electric heater?

    I want to try this exact setup on the same bubble tub... If you don't mind.. how well does it work.. and how do you use it? Can you keep the tub heater turned off, let the water cool all the way down and use the propane heater to get it hot quickly? Or do you just keep the tub heater on and use this to supplement the heat?

    I want to try this exact setup on the same tub... If you don't mind.. how well does it work.. and how do you use it? Can you keep the tub heater turned off, let the water cool all the way down and use the propane heater to get it hot quickly? Or do you just keep the tub heater on and use this to supplement the heat? I also love the idea of plumbing up both the return from the tub and a fresh water supply. That way you can switch over to fresh water to rinse off after getting out of the tub. Great idea.

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  • Convert Swimming Pool to Putting Green

    Many many years ago, when the pool contractor was digging a pool in my parent's yard, I asked him where he was taking all the dirt. He said he needed every bit of dirt that he dug out of pools and more to use to fill in the pools that he was removing. And, he told me that he really didn't remove them.. just punched holes in the bottom and broke off the top few inches.

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  • Slide Out Refrigerator Cabinet

    I went back and re-measured.. I don't think I have enough room.. right now I only have 4" between the wall and the refrigerator... I might be able to shift the fridge over about another 1/2" in the other direction.. but they would be some very thin shelves :-(

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  • Slide Out Refrigerator Cabinet

    good point.. most home refrigerators do incorporate a heating element around the outside case to prevent condensation.. I dont think they run very hot, fridge doesn't feel warm to the touch. But, it is something to think about. However, if the 'shelf' side of the slide out cabinet is next the the refrigerator, not much would ever be touching it.

    That is a good idea... I am going to think about it.. I wonder what the longest drawer slides I can get.. It would be good if the slide could slide out as far as the fridge is deep. I think I could get about a 6 inch deep set of shelves.. it could easily hold things like canned goods and spices.

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  • Slide Out Refrigerator Cabinet

    Nice.. I know the struggle.. 900 sq ft house here.. I have often thought about doing something like this, but then I would have to find another place to store the step ladder that I currently store in that space.

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  • Wine Bottle Lamp (Chandelier)

    no arduino.. no megapixels... i'm disappointed :-)

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  • tvengineer commented on jef400dread's instructable Rocket Stove V3
    Rocket Stove V3

    Nice instructable, thanks. Check out Sous VIde for cooking your steaks, you can hold them at the perfect temperature for as long as you like. Why use the small end of your charcoal starter chimney? I sear steaks on my starter chimney fully loaded. I start with newspaper then once the bottom coals are lit I put the chimney over an old box fan to feed air into the bottom. In only a few minutes the whole thing is roaring. A few seconds of holding the steak in the jes exhaust is all it takes to get a wonderful sear. :-) I still want to build a rocket stove some day though.

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  • tvengineer commented on ThomasVDD's instructable Hard Drive Speaker

    Years ago a coworker took the voice coil from a monster hard drive (something like 5 10 inch platters) and hooked it up to an amplifier and a function generator to drive it and connected the arm to a sheet of plywood. man that thing could make a racket :-)

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  • You probably don't want to hear it, but I'll say it anyway. If you are cooking your meat to anything past medium you have no idea what you are missing.

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