Instant Electric Water Heater

Frequently Asked Questions

1. QUESTION:
   Which is more effient to run with oil heat? An electric instant water heater or an indirect fired water heate?
   It would be for the whole house...2.5 baths, dishwasher, washer, 4 people.

   I have forced hot water now and oil heat. I am replacing an oil inner coil now.

   • ANSWER:
     due to the fact that you'd have to force yourself to think water conservation i recomend the elec instant water heater due to the fact it wont handle multiple hot water demands at once

2. QUESTION:
   which water heater is more economic? Instant water heater or electric geyser?
   solar heating system is not officiant in malta. so here is the two options which we can choose. ALso one heater is it enough for bathroom and a kitchen? thanks

   • ANSWER:
     both are economic it depends on our need . if u require more water go for geyser. if u need small amount of instant water go for Instant water heater

3. QUESTION:
   Which instant water heater must I purchase ?
   We have a gas water heater which uses 16KG commercial gas (currently costing about Rs 1200). We can use it for like 1.5 months then we must have a refill, which is too expensive. We use 120 litres every day. We want a replacement. Either, a better efficiency gas heater, or some electric heater. Which company offers one ? Primary requirement is savings and it must be instant water heater !

   • ANSWER:
     IFB Appliances is the best online shopping for Home & Kitchen Appliances in India. Compare best prices on washing machines, Dishwasher, Microwave and Clothes Dryer.

4. QUESTION:
   i have a Brazilian instant water heater and i want to know how it work and its electric blags?
   i want to reaper it and i dont know what the wiers to bloge in

   • ANSWER:
     Well, your question is hardly readable. Something about installing a water heater. Best bet read the instructions that came with it, or call a plumber.

5. QUESTION:
   which electric water heater is best INSTANT or STORAGE, eighter elec. consumption wise or hot water?

   • ANSWER:
     INSTANT
     for every thing.(consumption wise or hot water)

6. QUESTION:
   Hot water tank vs. Instant water heater?
   I am thinking of installing an instant hot water heater (electric) for our whole house (1600sq. ft.).
   In your experience, is it worth it? Does it save money? Any downfalls?

   • ANSWER:
     I have one customer that bought a top name electric whole house tank-less water heater, and had nothing but problems with it.

     The manufacturer would allow no one but a licensed plumber to do the warranty work, so every time the owners would get the next part in the manufacturer sent, they had to call me to do the work requested by the manufacturer.

     On paper, the system looks like it should work. But reality shows otherwise.

     Here is a very important point, if you do not have soft water, the unit will always be failing on you.

7. QUESTION:
   I am thinking of installing an instant hot water heaters (electric) for our whole house (1600sq. ft.).?
   I am thinking of installing an instant hot water heaters (electric) for our whole house (1600sq. ft.).In your experience,Does it save money? Any downfalls?

   • ANSWER:
     nope
     too many items to go bad, [they wont last for ever]

8. QUESTION:
   which is better water heater 1 liter or 3 liters?
   Which electric instant geyser(water heater) is best?
   1 or 3 Liter's.
   It should be electric and having continuous warm running water?
   Please Guide us.
   Thanks.

   • ANSWER:
     it probably depends on the application a shower would require the MOST water so I think that would need the bigger tank ie the 3 liter one..

     an application like washing dishes would require less continous hot water so it would be able to get by on 1L

9. QUESTION:
   Cheapest way to heat water for taps and shower?
   At home I have an electric shower, and an immersion heater for all other hot taps in the house. I usually put the immersion heater on for one night every 3 days. This does the trick. However, I'm tempted to buy and have installed, an electric hotwater point at the kitchen tap, and one for the bathroom tap. This would give instant hot water to the three main points in the house. It would also mean a quieter house, because the immersion heater wouldn't grumble away quietly through the night, and when running hot water through the pipes (ie to the downstairs kitchen) it wouldn't make that indescribable noise. (pipes expanding?) On Ebay, you can buy an instant hotwater tap for about £40 from China. Or a more expensive bigger unit to go under the kitchen sink, for example. Ignoring this initial outlay cost, would it be cheaper to have instant electric heater water points? - There are 5 adults in the house. (no baths)

   • ANSWER:
     Gravity system is bestway Where a space-heating water boiler is employed the traditional arrangement in the UK is to use boiler-heated ("primary") water to heat ("secondary") water in a cylindrical vessel (usually made of copper) containing potable water supplied from a cold water storage vessel/container, usually in the roof space of the building. This produces a fairly steady supply of DHW at low static pressure head but usually with a good flow..............

10. QUESTION:
    No hot water. Would a electric tankless water heater work?
    I live on the second floor of a two story house. The whole house hasn't had any heat or hot water for the past few years, no sink or shower hot water. I've been going to the gym to shower every other day.

    If I purchase a electric tankless water heater would that provide hot water for showering and cooking? I don't care if it's not instant, I can wait for my water to heat up AS LONG AS IT GETS WARM.

    Also, if I buy one, how do I install it exactly?

    Thanks.

    • ANSWER:
      Unless you have an uncontrollable penchant for wasting money, your best bet would be to simply replace or repair the existing water heater.

      As far as the installation of either goes: YOU don't. That kind of work requires plumbing, & electrical skills. If the W/H is gas or propane fired, working with the respective gas equipment requires certification(s). In Texas, DO NOT be caught working on propane equipment without a Railroad Commission card...

11. QUESTION:
    Electric or gas to heat water for showers, which is cheaper?
    I currently heat my water tank for our power shower/bath with gas. i have three daughters and they all shower in the morning, the gas is on for three hours to ensure there is enough hot water for all of them. However, our tank has an electric switch connected to the immersion heater in the tank which gives us instant hot water (like using and electric shower). My question is, would it be cheaper to have the water heated by the electrics for 30 minutes while the girls have showers or to heat the whole tank for three hours with gas. I know gas is considered cheaper than electricity but even in this case? And what about the environmental issues?
    Does anyone know what it would actually cost to heat with gas for three hours and with electricity for thrity minutes? Please give a reason for your answer!!! Thanks
    I live in North London

    • ANSWER:
      Sorry to say you seem a bit misinformed?? If as you say , you have an immersion heater in your hot water cylinder, it cannot be 'instant' there is no such thing. It will heat the water in a similar way to the coil in the cylinder. The gas boiler that you use will probably not actually be heating the water for the full three hours , assuming that you have a cylinder stat and other controls, conversely, the immersion heat will never heat enough water for 3 showers in half an hour! I guess that your cylinder is 40gallons or so?? The immersion heater will cost about 36p per hour when heating. If you want quick recovery, I suggest you put both gas and electric on for the duration of the showering period, this will leave the hw cylinder pretty well full of hot water when you turn off.

12. QUESTION:
    Question about electricity?
    An instant gas hot water heater is capable of raising the temperature of 2kg of water by 50K each minute.

    What problem might there be in designing a instant electric water heater which is to work from the ordinary mains supply instead of gas and achieve the same rate of heating ?

    • ANSWER:
      Use induction heater.
      It is capable to do that instantly.

13. QUESTION:
    Electrical Panel Upgrade?
    I want to upgrade my electrical panel for a house that is 1200 square feet. I have two bathrooms and appliances include a refridgerator, electric washing machine, gas stove and dryer as well as electric oven and dishwasher. I will also have a gas or electric instant water heater installed. How many amps will I need? The estimate I got recommended 125 amps but a friend down the street has a panel with 200 amps. I am confused.

    • ANSWER:
      To answer your question honestly electrical contractors figure your total amperage based on a calculation as per the NEC and there is a demand factor that is also taken in to consideration as well. Many people ask me all the time isn't a 100 amp service to small and why don't I need a 200 amp service isn't that the minimum required. The answer is 100 amp is probably enough for many homes unless they have a ot of electrical appliances and then depending on the size of the home and what they have a 100 amp service is fine.
      I will kind of give you a run down on what you asked based on the code and the demand factor I even gave you a little extra because you said gas stove and electric oven and I added central air to this for future use at 4500 Va as well which you do not say you have but in case you do I have added that to the total 3600 watts for lighting 3 watts per sq foot. Total load demands based on article 220 .11 and article 220.19 Percentage of oven and air go to 3.6 kva Two small appliance circuits and 1 laundry circuit as well.
      You come up to 56 amps total on your panel based on what you told me and with central air added to the mix so 200 amp is a ways off yet. 100 or 125 amp is fine in your case with room to add extras as well

      Electrical Contractor |><|

14. QUESTION:
    what type of shower heater do you suggest?
    im choosing between

    instant tankless shower heater

    or

    instant tankless shower HEAD water heater

    both are electric type

    thank you

    • ANSWER:
      Don't know exactly what the problem is with the water temp but if it is just about getting the hot water to the shower without having to send gallons down the drain while you wait then there is a small pump that you install under the sink in the bathroom which pumps water from the hot water line into the cold water line (not down the drain) until the hot water supply reaches the faucet. It has a timer and a thermostat so it comes on at the time of your choosing and goes off when you tell it to. We have two of them one in the upstairs bathroom which we actualy wired into the switch that turns on the light in the shower so when we get up in the morning we turn on the shower light and in 5 minutes or less we have hot water in the shower and the sink. Since we are only two in the house we don't feel the need to have the timer on every day and sometimes we want the shower in the middle of the day and all we need to do is turn the light on. We put one in the kitchen this summer when we remodeled because it took too long to get hot water in the sink and that one is run on the timer so I have hot water for cooking and clean up for several hours in the morning and again in the late afternoon/early evening. Off hand I don't remember the name of the pump but we bought it at Menards cost in the 0 to 0 range and you need an outlet under the sink or close enough to plug the pump in.

15. QUESTION:
    How to work out power of electric shower delivering 0.076kgS-1 of water for 3 minutes? Please help?
    Hi and thanks for looking at my question guys..

    I am really stuck on this... i am not asking for an answer or cheating my assignment... I just urgently need some help on how to work this question out.. any pyshics experts out there pleaseee help

    The use of instantaneous shower in place of a bath can have significance in both cost for househod and therefore enviromental cost. Compare the cost of using an instant electric shower delivering 0.076kgS-1 of water for 3 minutes, with bath water heated by an immersion for 80 minutes (use a typical power of immersion heater)?

    This is the question i am soo badly stuck on... You guys are my only chance.. Any helps very greatly appreciated

    thanks
    its says i need to determine the power of the shower to deliver this mass of water per second.......... otherwise than that.... thats all the question is giving me

    • ANSWER:
      What is the temperature of the heated water, and what is the temperature of the incoming water?

      What is an "immersion heater"? do you mean a conventional tank heater? In that case you need the size, the insulation, the length and material of the pipes, it's a complicated scenerio.

16. QUESTION:
    Solution to propane furnace discharging soot throughout the home?
    New Colman furance and new instant hot water heater, also converted propane cloths dryer and cooking range to electric.

    • ANSWER:
      It should burn clean. If you have soot you should check if the ventilation is blocked somehow.

17. QUESTION:
    Time required to heat water at....?
    A small electric immersion heater is used to heat 70 g of water for a cup of instant coffee. The heater is labeled “140 watts” (it converts electrical energy to thermal energy at this rate). Calculate the time required to bring all this water from 20°C to 100°C, ignoring any heat losses. (The specific heat of water is 4186 J/kg·K.)

    • ANSWER:
      about 3 minutes

18. QUESTION:
    I need help with a Physics problem, please i cant figure it out?
    A small electric immersion heater is used to boil 65.0 g of water for a cup of instant coffee. The heater is labeled 100.0 W, which means that it converts electrical energy to heat at this rate. Calculate the time required to bring this water from 17.0 °C to the boiling point ignoring any heat losses.

    • ANSWER:
      specific heat capacity of water = 4.18 J kg^-1 K^-1

      Change in temperature = 100 - 17 = 83K

      Energy needed to raise temperature = 83x65x4.18
      =22551.1

      Time needed = 22551.1/100
      =225.511s

19. QUESTION:
    i need help with this Thermodynamics problem?
    A small electric immersion heater is used to boil 65.0 g of water for a cup of instant coffee. The heater is labeled 100.0 W, which means that it converts electrical energy to heat at this rate. Calculate the time required to bring this water from 17.0 °C to the boiling point ignoring any heat losses

    • ANSWER:
      Heat needed: Q=m * c * dT
      electrical energy consummed W = P * t
      assume no loss of energy => Q=W
      => m * c * dT = P * t
      => t= m * c * (Tfinal - Tinitial) / P
      replace the constants c - specific heater of water (don't remeber) Tfinal - vap. temp = 100 C and you can find out the time needed

20. QUESTION:
    Thermodynamics: thermal energy?
    A small electric immersion heater is used to heat 100g of water for a cup of instant coffee. The heater is labeled "200 watts", so it converts electrical energy to thermal energy that is transferred to the water at this rate. Calculate the time required to bring the water from 23 C to 100 C ignoring any thermal energy that transfers out of the cup.

    The answer is 742 kJ. Can you show me the steps involved with solving this problem?

    • ANSWER:
      the answer you quote is an energy, not a time...let's follow this problem

      200W means the heater adds 200Joules of energy to the water each second

      the amount of energy needed to heat 100g of water from 23C to 100 C is given by:

      Q=mc(delta T) where m is the mass of the water, c is the specific heat, and delta T is the change of temp

      here, m=100 g
      c=4.2 J/gram/deg C
      delta T= 77

      thus, Q=100 g x 4.2 J/g/C x 77C = 32.3 KJ

      if the heater provides 200J/s, then the time needed to heat the water is

      t=32.3kJ/200J/s = 161.7 s

21. QUESTION:
    Need help with physics question?
    A small electric immersion heater is used to heat 54 g of water for a cup of instant coffee. The heater is labeled “170 watts” (it converts electrical energy to thermal energy at this rate). Calculate the time required to bring all this water from 18°C to 100°C, ignoring any heat losses. (The specific heat of water is 4186 J/kg·K.)

    • ANSWER:
      From 18C to 100C = 291.15K to 373.15K
      1 Watt = 1 Joule/s, so 1 W*s = 1 Joule

      4186J/kg K (373.15K - 291.15K) (1 kg/1000g)(54g)=
      4186W*s/kgK(82K)(0.54kg)

      4186Ws/kgK(82K)(0.54kg)/170W = 109 seconds

22. QUESTION:
    energy transfer/temperature question?
    A small electric immersion heater is used to boil 154.0 g of water for a cup of instant coffee. The heater is labeled 250.0 W, which means that it converts electrical energy to heat at this rate. Calculate the time required to bring this water from 17.0 °C to the boiling point ignoring any heat losses.

    • ANSWER:
      Exactly how this should be answered depends a lot on how precise you wish to be. The numbers given in this problem indicate you should have three significant figures. Unfortunately, the specific heat of water is not constant, and ranges from about 4.178 J/(g*K) to 4.219 J/(g*K) as it reaches the boiling point. Personally, I'd just use two significant digits for an approximate answer (especially as you are already allowed to ignore any heat losses). So
      ΔQ = mcΔT
      Where
      Q is the heat
      m is the mass
      c is the specific heat capacity of water
      T is the temperature
      ΔQ = (154.0 g) * (4.2 J/(g*K)) * (100 °C - 17.0 °C)
      ΔQ = 53684.4 J

      Since a watt is a joule/second, the time is...
      t = (53684.4 J) / (250.0 W)
      t is approximately 210 seconds

23. QUESTION:
    thermal physics HELP! please?
    A small electric immersion heater is used to heat 71 g of water for a cup of instant coffee. The heater is labeled “99 watts” (it converts electrical energy to thermal energy at this rate). Calculate the time required to bring all this water from 21°C to 100°C, ignoring any heat losses. (The specific heat of water is 4186 J/kg·K.)

    please help???

    • ANSWER:
      heat(in kcal) = w*t/4200
      Where w is the wattage ( here 99 watts), t is the time (here t in seconds) and heat is the energy required to raise the temperature of the water from a certain point to the other higher point ( here from 21 degrees to 100 degrees).

      First of all,
      Heat energy required to raise the temperature of 71 grams of water from 21 degree to 100 degree is

      (100-21)*71 = 79*71 = 5609 cal = 5.609 kcal

      now putting 5.609 in the above relation

      5.609 = 99*t / 4200
      = 23557.8 = 99t
      =23557.8/99 = t
      = 237.957 = t

      Therefore time is 237.957 seconds.

      Converting it into minutes.
      237.957/60
      = 3.96595 minutes

      Converting 0.96595 into seconds

      0.96595*60=57.95

      Therefore total time will be 3 minutes and 58 seconds (approx.)

24. QUESTION:
    Central Heating System?
    I've just bought a house that only has electric storage heaters working off an economy 7 supply. Hot water is from immersion heaters in the hot water tank.

    I would like to perhaps install a different system that will be more cost effective, and am wondering what the best options might be in the UK.

    The house is a 1940's semi-detached in Glasgow (so solar power might not work, though rain power might!!), has a main fireplace downstairs and one up stairs that can be opened up (good condition, just need the metal work and wood to burn), large front and back garden. Nearest gas supply is 200m away so will cost a few thousand to install gas main plus a few thousand to install gas appliances. The house has cavity wall insulation and double glazing, loft insulation is about 100m deep (haven't had chance to check yet) and can put additional insulation in there (I want to board out the loft, insulation can also go under the tiles). I have no idea about underfloor insulation - probably none. Instant heat will have to be from electric fan heaters.

    So there it is. What are the best options for me - I want to make the house warmer, have hot water and cost less over the next 5 years or so.

    If you can give me an estimate of cost and potential savings that would be even better.

    The answer might be to leave it as it is and have higher electricity bills but not spend thousands to reduce the power costs

    • ANSWER:
      Air source heat pump and water filled central heating system.
      Will be more economical.
      Alternative is air conditioning units in heat pump mode. Will cool in the summer too.

25. QUESTION:
    Is my story okay so far? Thanks a ton!?
    Yeah, I guess it's a little long, and yes, the idea may seem too overused nowadays, but please, just be honest on what you think. Sorry about mess ups with the spelling or grammar. I'm 13 by the way! Thanks and enjoy! ~~~ -I fell into my house and slammed the door shut behind me- Deryk no more than 3 feet away. My breathing was out of control; it was going crazy. So was Deryk. Right before I had run from him, leaving him in his broken-down car about two blocks from my house, he had tried to convince me that he was a... a shapeshifter! He had declared that he could change his features in an instant! Like eye color, or hair length, or even species! Even crazier, he had attempted to convince me that I, too, could shift my appearance. Who the hell is jacked up in the head enough to believe that?!
    -"Please Alexadria... uh, Alex. Open the door, we need to talk this over. I know I didn't quite annotate this enough. Just come out and I'll explain the whole thing." Deryk leaned on the other side of the door, but I didn't even dare to breathe- to let him acknowledge that I was still listening. I looked through the peephole and found him looking back at me. Surely, these things were created for one-way vision, right? Though my mind agreed to this, I jumped back with a small squeak.
    -"I know that you're just standing there, Alex. You're waiting for me to leave, aren't you? Well, I am not going to leave until you speak back. All I need is a simple 'go away' or 'whatever'. I just need to know that you're not in shock or something.
    - I knew that if I were to tell him to leave, he'd go, but I didn't want to give him the satisfaction that he could practically force me to speak. I don't know, it was sort of a pride type of thing, I guess. I am not going to leave until you speak back. His words sat inside of my mind as I remembered seeing a weather report earlier. The man had said to expect much snow. I could feel the chilly air crawling under the front door, and it was already biting at my fingers and toes. If it were to snow, Deryk would just give up. He'd probably walk to his dead car and call a tow truck or something.
    -I tiptoed away from the door and into the kitchen. As I walked by, I flipped on the electric heater, hoping to get a little bit of feeling returned back into my appendages, which I now had as much control over as I would a rabid squirrel. Assuring that the windows in the kitchen were locked- though I know Deryk wouldn't seep that low, but it was just assurance. I set a pot full of water onto the stove, and feeling the heat, I stuck my hands over it. I couldn't help but to emit a sigh of relief. When the water began to boil, I found a coffee cup and slipped in a bag of SleepyTime tea. The minty smell eminating along with the steam seemed to suck any strees and tightness from my shoulders. They slumped in relaxation, and I almost forgot about the previous events. I flipped off the warm flame and left the pot to cool. Slowly, and quietly, I returned to the livingroom. Deryk was probably gone anyways. I sank into the couch, pulling a blanket over me. I switch the TV on and found that it was on Wheel of Fortune.
    -"I love this show!" I smile to myself. I watch as the taller woman in the middle bent down to spin the wheel. She gets her chance to guess a letter. I laugh to myself when I find that I was talking to the TV. "Guess the letter U!" I groan. The woman guesses 'O' and there are none. I catch myself snickering at her. "Shoulda listened to me!"
    - I sigh quietly and finish off my tea and feel the change in the temperature in the room. When I sink even further into the cushions, I feel my eyelids sliding shut. The last thing I hear, considering all I can see is the back of my eyelids, is the sound of silence. Before I have time to wonder what happened to the television or sounds of the heater buzzing; sending heat my way, I drift off to a restless sleep.
    ~~~
    -My sleep is full of weird dreams, but none seem very long. The most prominent one is an image of me standing there, Deryk by my side. He is in a wolf form, though. I am standing, clad in nothing but air. Suddenly, tremors overtake my body, and my ears become pointed. Wiry hair emerges from my skin, and claws spear out where my fingernails once were. I hear a rumble far off, and it changes to a slight growl until it ends up as a full howl. It is coming from me. I can see myself in a reflection, and as a small-framed wolf, I still look fierce and majestic somehow. I look towards the wolf that I assume is Deryk and assure it, being that his eyes never changed. He shoots me a proud look, and somewhere inside of this nonverbal message, it is spiked with love and exaltation.
    -I jolt awake and shudder, the cold air blasting me. The blinding white outside hinted that it was snowing, maybe there was even a blizzard. I stood
    up and realized that the power was out, yet I could see easily. The cold bothered me, and I pulled the blanket tighter around my body. I stepped towards the door to see how snowed-in and dark the town is. Pulling the door open, just a little, I took notice that I had only been asleep for a little bit, because there wasn't too much snow, but it was coming quickly. I opened the door, and shivering, took a step outside. I screamed as I tripped over something on the porch. Blood seeped out of my hands and knees, but that wasn't why I was crying. I looked back to see what I had tripped over, and there, lying in a ball, was Deryk. He was deathly still, and I hoped that I could save him, though I did think he was crazy, I couldn't let him die. I just couldn't. I strided to him and knelt down. His body was really cold, but I could hear his shallow breath. I smiled in relief and attempted to pick him up. A grunt of exertion escaped me as I walked into my house, him dangling in my arms. Laying
    him on the couch I ran back to shut the door. I remembered a survival skill from Girl Scouts. They had told us how to help someone who was ill with hypothermia. Skin on skin contact. Body heat was the only way. Oh joy.... ~~~ Thanks, I know it may not be great but it's only a rough draft. Hope you liked it at least a little! (:
    Oh! Woops! I completely forgot the vowel thing on Wheel of Fortune! Thanks for pointing that out! (:

    • ANSWER:
      It is quite overused, but it's pretty well developed for someone of your age. I'd like to read more about it, actually. It's a popular topic, because that type of fantasy is very 'in' right now.
      Very nice.
      Oh, and by the way, you have to buy vowels on Wheel of Fortune, you can't just guess them, so make sure you include that.
      Hope this helps.

26. QUESTION:
    Which is more effient to run with oil heat? An electric instant water heater or an indirect fired water heate

    • ANSWER:
      More information would be helpfull for a proper answer. What does your present heating system consist of? How much hot water do you need and where? Is this for a whole house or a point of use application?