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combi

Welcome to the forum. Although you can post in any forum, the USA forum is here in case of local regs or laws

Recent contents View information Top users
  1. GrumpyGrampa

    Combi Boiler/Unvented system Isolation

    Morning, I'm not a plumber but keen DIYer. Couple of pieces of advice would be great. (1) I've been trying to get my head round combi boilers - specifically how to isolate before renewing a tap or whatever. Is there a schematic that shows where to isolate? Pictures, a web site I could learn...
  2. A

    Oversized oil combi

    Hi, I’m removing my old gravity fed hot water tank and 12kW heat only oil burner and was going to replace with a combi as I have very little internal space. My OFTEC installer wants to fit a 21kW or even 26kW grant vortex pro combi (suggesting 26kW for better DHW). My heating system is about 8kW...
  3. T

    Baxi Platinum+ Combi Controls

    Hi, To cut a very long story short, Baxi are offering me a Platinum+ 40KW Combi as an alternative to a Megaflo Cylinder that has broken down. However, they are not providing labor costs so I will need to have my own plumber undertake the works. This boiler will effectively replace a 14 year old...
  4. S

    Combi boiler DHW lukewarm

    New ideal combi boiler 4 months after install. The DHW temperature drops to Luke warm then a few days go by then it goes back to where it was. The digital readout stays the same at 55 c the boiler pressure is constant heating is fine no other issues. Any advice.
  5. B

    Mystery catastrophic combi boiler leak

    Hello, The other week was below freezing weather, so I put the heating on my combi boiler. The timer was set to come on 15min per hour overnight. In the morning, I went into the kitchen to find the boiler was dead, about 3 to 5 litres of water on the floor beneath the boiler and the kitchen...
  6. D

    New combi choice - manufacturer with the 'best' controls?

    Hi all. Asking for a friend who is getting a new combi. They'd short-listed the WB Greenstar 4000 and Vaillant ecoTec Plus 832, and asked for my thoughts. I didn't have any, other than to ask what controls they were planning to use with them, and that's when I opened a can of worms. The...
  7. H

    Combi boiler problem

    Hi this is my first post so please be gentle. I have a Worcester greenstar 28i junior combi fitted in my house, we were having a troublesome drip from the back right of boiler, we found a gas safe plumber who come round and had a good look, he told me the back right hand block was leaking and...
  8. L

    Hot water issue with combi boiler

    I have a combi boiler, the hot water to my bath and taps upstairs is hot and stays hot, aswell as the hot tap in my downstairs bathroom, but in my kitchen the hot tap gets very very hot but it only lasts a couple of minutes then runs cold. I don’t know if it’s connected but the previous owner...
    • Lotte29
    • Thread
    • boiler combi combi boiler hot water water
    • Replies: 1
    • Forum: Boiler Advice Forum
  9. P

    Changing from system to combi boiler with under floor pipework.

    Wondering should i change a system boiler with a combi if I have underfloor pipes in a single storey 2 bed 90s bungalow There are only 9 bungalows in the close and I was told 2 of these had leaks in floor when they changed to a combi by a neighbor. He said as he was an engineer he would not...
  10. R

    Vaillant Sustain 28kw Combi Heat Input

    Could anyone tell me whether the Vaillant Sustain heat input is noted in gross or net please. I was sure it was NET but someone has said it's gross which makes no sense at all. I work all my gas rates to NET so if I'm wrong my gas rates will be way out. I've included the data badge.
  11. A

    Combi Gas Boiler Intermittent Problem - Need to identify replacement part?

    Hi All, Combo Gas Boiler - Immergas Zeus Mini I’m hoping you can maybe help me with an intermittent issue I’m having with my Immergas Zeus Mini Combi Boiler. It works for weeks and then has a sporadic issue with igniting the boiler? I’ve uploaded a video so maybe you can take a Quick Look to...
    • Andrew Thompson
    • Thread
    • boiler combi gas engineer part replacement
    • Replies: 3
    • Forum: Boiler Advice Forum
  12. B

    POTTERTON PROMAX 28 COMBI Boiler - Hot Water Issue

    Hello, I am seeking some advice, I have a POTTERTON PROMAX 28 COMBI Boiler and I noticed yesterday that the water around the house is no longer warming up. The heat exchanger has been changed 6 months ago, so I do not believe it is that. Does anyone have any ideas on what it could be? Thanks
  13. P

    Viessmann combi starts when cold, mixer, tap is opened

    Recently had a Viessmann Vitodens combi boiler installed, quite often when the adjacent cold mixer tap is opened the boiler starts for a few seconds! Can anyone tell me what is causing this? And how to cure?
  14. J

    Filter not on Ecofit combi

    Vaillant Ecofit boiler fitted into designer kitchen cupboard. No filter fitted. Boiler needs replacing type for type. No room to fit a magnetic filter anywhere without spoiling the kitchen. Will not fitting the filter but dosing the system with X-100 inhibitor make the guarantee void? thx in...
  15. J

    WB Greenstar 4000 Combi Fault Code 2965

    What is the boiler flow temperature required to flag this 2965 fault code?. This, I believe, is a blocking code that trips the burner but when/if it resets. the burner will refire without any boiler reset? If this fault code is up while in CH mode and there is a demand for HW, will the boiler...
  16. Roy_66

    Insulating pipes next to Combi

    Prompted by a surveyors energy efficiency report (and getting grants as this job belongs to a small charity) I've been asked to lag the pipes in this boiler cupboard. So questions: 1.Anybody got a photo of a good professional job please. 2. Where to stop the insulation under the boiler...
  17. N

    Combi Boiler water leak.

    My son moved to a new build home in Cornwall last November. Yesterday evening he found a quantity of water beneath the Ideal Combi boiler and a steady water drip from the boiler. After clearing up and putting a container beneath the boiler, he went to bed. This morning the water drip had...
  18. A

    Should a plumber inform you that your new Combi boiler would be no good with a digital pump.

    Hi. I recently had a renovation done. My builder installed a new Combi boiler instead of my system boiler. He connected the pipework to the digital pump. He did not inform us that we would need a new processor because we had changed to a Combi and subsequently a valve blew. Should my builders...
  19. P

    Milky hot water. Recently had a Viessmann 100-W combi boiler installed. Now when the hot water reaches any tap it is very 'milky'. This appears to be

    Milky hot water. Recently had a Viessmann 100-W combi boiler installed. Now when the hot water reaches any tap it is very 'milky'. This appears to be micro bubbles and clears, upwards, in a few seconds leaving no residue. Though this is a hard water area in 45 years have never had this cloudy...
  20. Zig168

    Combi Boiler vs System Boiler

    I think the last discussion was back in 2021. A few questions to guide any discussion. Which are the cheapest to heat over the year, system or combi in an average 3/4 bed property? Which will be the more reliable and cheapest boiler type to repair over the next 10 years? Is there a better...

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