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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. H

    Shower going from hot to cold - Main Combi 24 Boiler

    Hey everyone, I'm hoping for some help/advice with my shower. I've a Main Combi 24 boiler, and my shower is from a mixer tap over the bath. When the boiler flame lights, the shower will be hot almost instantly, but a few minutes into the shower it'll go completely ice cold. I'm then soaped up...
  2. C

    New Boiler - Pressurised System or Combi Boiler?

    Good evening, We are having issues with our current system, mainly around the water pressure being low and having to rely on shower pumps to get enough pressure for our showers - our second pump in so many months has just died so I'm sick of it and figured It's probably worth it in the long...
  3. Dame1701-

    Refill a Baxi combi boiler (24 series)

    Hi guys, We have a baxi combination boiler which needs to be re-pressurised (error code 119 I believe). I've done this several times on different boilers using the tap on the front. I just want to confirm that we need to turn the two taps at the front to repressurise. From what I understand we...
  4. T

    Help with an Ideal combi boiler

    Hi, I live in Dartford Kent. I have a ideal combi boiler which is roughly 6/7 years old. When the hot water is on and I run the hot water the pipes to Immersion tank make a loud vibrating burping noise. Any ideas what the issue would be?
  5. D

    Pumps to boost pressure for combi boiler flat?

    Hi, I live in a 4th floor flat, with 2 recently refurbished showers and a combi boiler. The pressure in the showers was poor, so after getting some reassurances that a gravity fed pump was still ok for my flat, I had a gravity fed salamander pump installed, but after a few weeks of it working...
  6. M

    Combi boiler shower hot and cold

    I had a plumber out to service and do a gas certificate for my combi boiler. Since then my shower that runs off the boiler will not stabilise temperature. When I twist the single lever mixer tap the shower goes too hot or too cold. He says this is not his fault and will not come back. I say it...
  7. L

    Combi boiler modulation for low heat output

    I'm looking to buy a 24kW combi boiler with only 4 radiators rated at 1.7kW each, so I can later expand and add more radiators. I expect relatively low heat dissipation from the heating circuit. If I run the boiler from cold, the water heats up to say 40 degrees in the heating circuit and the...
  8. J

    Will a new Combi boiler improve shower flow??

    As the title says. I have been going round in circles deciding what to buy or get fitted (with a raft of various advice).....the short story (so far). I have an old Combi boiler needs replacing and, I am having a new bathroom installed in October but, I want to improve the all round shower...
  9. B

    Thermoststic Shower - Hot Water Pipes Bang

    Hi folks I have a problem. Our shower is a Triton thermoststic run from an Alpha combi boiler. The pipes began making a noise when the hot water was turned on (any tap) and we realised if the shower thermostat was turned to coldest setting this resolved the noise. But .... now the hot taps...
  10. D

    Gettting CH but not HW

    Hi I have a Ideal Combi 35 boiler, we are getting CH but not HW. I have been looking around and seem to think it’s the diverter valve. Any suggestions would be great fully appreciated. Cheers
  11. A

    Recommendations for new combi boiler install

    Hello, I'm looking for advice on replacing a back gas fired boiler with a new combi boiler. I was thinking of placing the new combi boiler in the store room where the mains gas meter is located. Been looking a Worcester Greenstar 32CDI compact combi boiler but really looking for recommendations...
  12. L

    Worcester 34 cdi combi boiler

    Guys Worcester 34cdi combi Gc no 47 406 36 the heating works fine. On hot water the boiler temp builds to 100 and cuts out. Obviously hot tap goes cold. As heating was working fine and stays around 70 I decided it must be the plate. Presumed pump ok as well Changed the plate heat exchanger...
  13. T

    combi boiler not kicking in

    Hi all, i'm relatively new to the world of plumbing and bathroom fitting. I've recently fitted a bathroom and the new basin tap (Bristan Orta Mixer) wont kick in the boiler when the hot is turned on. The new bath mixer and the existing kitchen tap work fine although the hot has to be turned...
  14. J

    Bosch CDI 30 combi boiler

    Hi, my boiler has been having an intermittent fault no one can seem to cure. When the hot tap is used , usually first time in the morning, it creates the boiler to over heat. I have to wait for it to reset itself and cool down then usually ok. Apparently not heat exchange plate.
  15. I

    Combi boiler swap.....how long?

    Just wanting to hear people's thoughts on how long you take/quote to carryout a straight forward combi swap. I am currently quoting one day and I must admit it can be a struggle, especially when there is more than average amount radiators to flush. Basically, my wife thinks it should be a day...
  16. N

    System or combi boiler?

    Hi guys We want to do a whole revision of our boiler system- we currently have a system boiler at the moment with a water tank upstairs. One bathroom currently with electric shower and a 2nd bathroom still being constructed. What do you guys advise? Please let me know if this is in the wrong...
  17. marcuspreedy

    No DHW from combi boiler

    Hello I am having to replace the unvented hot water system in my property, and as a temporary measure to get DWH downstairs I have un-isolated the supply from my Grant combi boiler. But, no hot water is forthcoming! I think it may be a problem with the Danfoss set3e programmer which a builder...
  18. J

    combi boiler, pressure continuously increasing.

    Hi, I have a vaillant ecotec plus 837 and one day noticed the pressure was maxed out therefore bled the radiators to drop it down to 1.2~1.4 bar. Two weeks later, I noticed my pressure increased back up 2.5 bar so had to bleed the radiators again. A guy at work told me the increase in...
  19. D

    What is this error code on Bosch combi boiler?

    I've been having problems with my boiler since I moved house. Today my Hive thermostat was offline, then it recovered but after that my boiler's central heating had problems starting. I've reset the boiler AND turned it off/ on and despite that I am getting the above error - which I cannot even...
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