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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. J

    Drain down a Worcester Hi-Flow 550cdi boiler

    Hi, I have the boiler as above which has been very good for the last 13 years or more and is still relatively going strong. However, now, the secondary heat exchanger is kettling and the easiest option is to replace it. Although Worcester Bosch do sell a cleaning kit, whatever route I take, I'll...
    • John Holt
    • Thread
    • combi boiler drain down worcester
    • Replies: 1
    • Forum: Central Heating Forum
  2. J

    Advice combi boiler plumber says can't fix expansion vessel/access it?

    Hi there, I was wondering if anyone could advise if I should get a different plumber for a 2nd opinion. Basically, my combi boiler is in my attic. It is overpressurised at the moment and the overflow pipe always drips. I had a plumber round, he seemed good and honest and knew the neighbour so...
  3. C

    Removing cylinder and installing combi boiler. Pipe work query

    I have a question regarding combi boiler installation. I’ve just completed an attic bathroom where the previous plumber had put in the first fix of qualpex down to the airing cupboard which is standard practice. I’ve come a later stage to finish the bathroom but I now find that in the airiing...
  4. C

    Expansion vessel for potable water for a combi boiler

    Hi,a customer of mine has a combi boiler and they don't have an expansion vessel for the potable hot water supply. I know there's an expansion vessel for the closed-loop central heating circuit but I doubt the combi boiler has one for the potable water. I was thinking to put one in the airing...
  5. G

    Is this combi boiler installation within safety regulations?

    I am unsure what are the regulations as to how close the pipework coming out of the bottom of my combi boiler can be to the electrical fuse spur? Also, how close can the magna flow be to the electric cable? At present water drips from the pipes coming out of the bottom of the combi boiler onto...
  6. M

    Single pipe system new combi boiler

    Hi everyone. I’m a homeowner, in essence when we moved in we weren’t aware that our house was a single pipe system we have now found out after the water cylinder has packed in and developed a leak. We have had a Heating engineer round who has advised us to fit a combi boiler doing away with the...
  7. A

    Do you have balance hot and cold water pressure with a combi boiler?

    So getting a digital shower and it says the hot and cold water should be balanced. Am I right in thinking they should already be balanced with the hot taking on the cold pressure entering the boiler or am I way off? Cheers
  8. M

    Baxi Combi Boiler (Duo Tec) - water not heating

    Hi all I’m having a problem with my Baxi combi boiler and wondering if anyone is able to help. In short, the water isn't heating. A few months ago (c.2 months) my Baxi combi boiler had an issue where the hot water would go hot and cold on a regular cycle; it would get hot, then cool down, then...
    • mtaylor39
    • Thread
    • america baxi boiler central heating system combi combi boiler heating not heating usa water
    • Replies: 2
    • Forum: USA
  9. T

    Combi boiler flame loss during current windy weather

    Hi, I have an ideal logic plus combi boiler that has been working fine for all of winter. With the recent storms when the wind speed starts getting up the boiler keeps cutting out with a "Flame loss" error. It'll reignite first time no problem and then continue until a large wind gust then...
  10. D

    Nest connections to electric combi boiler.

    Hi, I moved into a house with a Trianco Maxi Aztec wet electric combi boiler. The system is too expensive for us to run, so we are removing in 3/4 weeks. Aside from being too expensive, it is not running correctly... We have to call for hot water about 25 minutes prior to use (this is not a...
    • Dan'll Try It
    • Thread
    • america boiler combi combi boiler connections electric nest usa
    • Replies: 1
    • Forum: USA
  11. Pgor68

    Combi boiler pressure at 3bar

    Hi all. I have recently drained system, removed all rads and manually flushed them all. Filled system back up, bled all rads and repressurised the system to between 1 and 1.5 bar. The system was off all night waiting for the timer to kick in and when I checked in the morning, before it came on...
  12. O

    Where's my leak? They say not the boiler, but I am not so sure.

    Hello, Can anybody please advise. For months now our old Ideal Mini HE C24 (combi boiler) has had pressure problems. It won't stay above 1 bar. Occasionally I top it up, to above one bar, twice in a day, other times if I am happy to leave it about a 1/3 of a bar it won't complain for a week...
    • ought74
    • Thread
    • america boiler combi boiler leak prv system usa
    • Replies: 23
    • Forum: USA
  13. F

    Your opinion on this combi boiler installation

    Hello. We recently had a combi boiler installed to swap out old plumbing sustem with water tank and gas cylinder. You can see end results in the photos. I would like to ask for your opinion on how well this has been done as I was originally promised only two little pipes coming down from the...
  14. A

    Combi boiler pressure

    Hi I suspect I have a leak in my central heating system. Have to refill it every 3 months when the pressure drops below the operating level. Replaced prv and pressure vessel as that was faulty but still having the same problems. More than will to pay someone to come round . I’m in Orpington Kent...
  15. R

    combi boiler pressure bouncing only when hot water is being used

    Combi boiler pressure bouncing only when hot water is being used , could this be the diverter valve diaphragm..... cheers Rob
    • robqqq
    • Thread
    • america being boiler combi combi boiler hot hot water pressure usa water
    • Replies: 7
    • Forum: USA
  16. C

    conversion to hive heating on combi boiler

    hi,i need slight help with adding hive system.
  17. S

    Grant Oil Combi Boiler Hot Water Efficiency

    Hi, We have just had a grant oil combi boiler installed and we have two options to heat our hot water; we can have the water on continuously which will keep the very small water reserve in the boiler at a certain temperature. Or we can have the hot water off and then just boost it when we...
    • Sara Lowt
    • Thread
    • america boiler combi combi boiler efficiency grant hot hot water oil usa water
    • Replies: 1
    • Forum: USA
  18. cjaneway69

    Can my Ariston Combi boiler be fixed?

    Hi all! I'm hoping someone or many of you, can give me some advice please. We have an Ariston Combi Boiler installed in 2004 (I found the invoice! I had thought it older, but apparently not!!). We've been having issues with it for some time now, years in fact, but it's always started working...
  19. D

    Water Hammer following Combi boiler installation

    Worcester Bosch Greenstar i combi installed. Since installation water hammer happens when hot taps are turned off, but only when the heating is on. Have you experienced the sam?
    • Don Blowere
    • Thread
    • america boiler boiler installation combi combi boiler hammer installation usa water water hammer worcester bosch
    • Replies: 4
    • Forum: USA
  20. D

    Combi boiler noise when running

    I have a Worcester combi boiler . About 8 yrs old . It has started making this strange noise. Any ideas
    • Derek st
    • Thread
    • america boiler boiler noise combi combi boiler noise running usa
    • Replies: 4
    • Forum: USA
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