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tankless

Tankless water heaters — also called instantaneous, continuous flow, inline, flash, on-demand, or instant-on water heaters — are water heaters that instantly heat water as it flows through the device, and do not retain any water internally except for what is in the heat exchanger coil. Copper heat exchangers are preferred in these units because of their high thermal conductivity and ease of fabrication.
Tankless heaters may be installed throughout a household at more than one point-of-use (POU), far from or without a central water heater, or larger centralized whole house models may still be used to provide all the hot water requirements for an entire house. The main advantages of tankless water heaters are a plentiful, practically limitless continuous flow of hot water (as compared to a limited flow of continuously heated hot water from conventional tank water heaters), and potential energy savings under some conditions due to the use of energy only when in use, and the elimination of standby energy losses since there is no hot water tank. The main disadvantage of these systems are their high initial costs (equipment and installation).

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  1. B

    dials on tankless gas geyser

    Hi everyone, What does the summer/winter dial do on a tank less gas geyser? Should you adjust it or leave it on one mode or adjust it according to seasons? Any info would be great thanks.
  2. R

    Tankless - Cold Water Hamer Sound with Cold Line Spring Check Valve

    I just had installed a Navien NPE-2 with built in recirculator pump. I have a dedicated return line. The check valve for the recirc is built into the unit; a spring check valve was placed on the cold line (per the manual) after which there is an expansion tank (on the cold line) in a T junction...
  3. D

    Tankless Water Heater in Closet

    'd like to replace this with a tankless water heater. We live in a condo and this currently power vents out to I believe the roof. We are on the 3rd floor of a 4 floor building. Can I replace this with a tankless water heater? Will there be enough combustible air around the unit? Can it...
  4. CanadianEh

    Advice Required: Tankless with Storage tank /with winter Hydronic use

    Here is what I have going on, and wondering if someone can help me solve the problem.. Quick details: I live in Canada so the cold ground water temp can be an issue in the winter. I had a Bradford white 75 gallon water tank that just gave up. This tank was used for my main home hot water...
  5. R

    Tankless vs TAnk Water Heater

    I want to replace my tank water heater with a tankless one. I live alone. Is it really more energy efficient?
  6. S

    Advice needed on tankless water heaters

    Hi all At the moment I am living in misery and need some help/advice. This is my story: Both the elements in my hot water cylinder has died, they`ve been replaced several times over the years but unfortunately the last time this was done the "plumber" cracked the seal and I been told no...
  7. H

    Tankless Water heater: Expansion tank burst

    Hi. It's cold as heck in Austin. Temps dropped to single digits last night in Austin. Last night loss power @ 2AM. This morning around 11:30am, heard a loud explosion coming from outside area where the tankless water heater system is installed. Noticed that the expansion tank exploded. You can...
  8. D

    Should I go with tankless point of use water heaters?

    Hi, I'm renovating (rewiring electricity, redoing and adding water pipes, gas pipes, moving walls) a house for the first time ever and, among other things, I will need to sort out hot water. Understandably, I have some questions. It's a very small house currently with only a kitchenette...
  9. P

    Tankless water heater ( undersink )

    Hello. I notice several tankless water heater units being sold Ebay. Some of the listings show these units fitted under sinks and connected directly to the hot side of a mixer tap. I had been under the impression, that units such as these required an open vent on the outlet side of the...
  10. R

    Will low water flow affect the function of an electric tankless water heater?

    I have a cabin about 300' from my well and about 30' elevated from the well. The water heater doesn't work properly. The flow is low through the tankless electric water heater. Is it necessary to increase the flow? If so, how am I able to do that?
  11. J

    USA Tankless oil boiler/water heater - not enough

    We are a family of 5, we are not getting enough hot water from our relatively new tankless heater (it fluctuates in heat all the Time and won’t fill up a bath consistently with hot water - can’t support 5 people) . We want to add a water tank to increase amount of hot water available but have...
  12. S

    Tankless Toilet from Attic Tank

    Hi Has anyone tried running a toilet without a cistern from an attic tank in a normal house? I'm thinking of installing a toilet with a hidden cistern in my house, and concealing it is a bit of a problem. There's a nice big tank in the attic a few meters above, so I'm wondering if it'd be...
  13. D

    Instant tankless electric water heater?

    Hi everyone I try to buy/find a Instant tankless electric water heater in uk as the flat I living in have no gas and I want instant hot water supply looking for a water heater that: Instant Heat up water (no more 1 hour waiting) Use Electric (no gas no coal no LPG) Single Phase (no money...
  14. S

    Tankless Electric Water Heater Installed on the Outlet of a Hot Water Cylinder?

    I s it possible to install a tankless water heater on the outlet of a hot water cylinder feeding a thermostatic mixer shower? the tankless heater would need to be thermostatically controlled and capable of operating at low pressure. The advantage would be that the majority of the time the water...
  15. R

    Electric Tankless Boiler Suitable for Home Use?

    Hi there, I currently have a large Megaflow electric boiler in my flat that hast just recently broken down.. I would like to take advantage of the situation and replace it with a tankless boiler to allow for more closet space. I have no gas in my flat. I have researched tankless boilers and the...
  16. C

    Tankless heating

    Hi all, I have a seized immersion in a very old and now buckled 1050x450 direct combination HWC for my flat. I am selling the flat moving within a few months and was weighing the cost of either a new cylinder or installing a tankless multipoint instantaneous water heater-for the right price...
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