Central Heater Boiler replacement

  Terry Brown 19:51 16 Dec 2011
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Answered

My boiler is now 17 years old and while it is doing well, it will not last forever so I am looking for a new boiler.

If you had had a combi boiler fitted recently (last 2 years) could you give me the name & model of the boiler and satisfaction level from 1(poor) to 10 (Very Good)

Noise , efficienty , gas usuge (compare to previous boiler), servicing required and number of radiators (mine is 7)

Thank you

Terry

  Forum Editor 23:29 16 Dec 2011

You will find that there is a wide range of combi boilers from which to choose, and the one you go for will to some extent be decided by the size of your house, and the hot water demand that the boiler will have to cope with. Hot water demand is of more concern when choosing a combi - almost any decent model will easily cope with 7 radiators on the heating side.

Leading makes are:- Vaillant, Worcester Bosch, Potterton and Baxi.

My personal choice would be either a Vaillant Ecotech Plus or a Worcester Bosch Greenstar. If you have two bathrooms, go for the Greenstar 42CDi

  Condom 20:55 17 Dec 2011
Answer

We had our old combi replaced after 23 years wonderful service with a new Worcester Bosch Combi.

This new one is very quiet and so far has given 20 months of effortless heating and hot water. You can get different sizes to meet different sized houses but we have 5 bedrooms and 2 bathrooms and this keeps them all nice and warm. Also seems a bit cheaper to run than the old one although price comparisons are very difficult to work out in the current climate.

We did have one big problem but it was not down to the boiler per se. The new boiler required a newer type of flue and the installers broke a roof tile which we were not aware of until many months later when a damp patch appeared in an internal wall. Proving it was the installers fault was nigh impossible by then but the house insurance thankfully covered it and the subsequent damage. Combi are great but if you need a newer flue do check the roof afterwards if you can.

  Forum Editor 18:47 18 Dec 2011

"If you can't run it to a drain pipe internally fit a thermostatically controlled trace heater to the drain pipe. These draw a small current and only run when the temperature drops to freezing point."

Good advice, but a point worth mentioning concerns connecting condense drains to internal drainage runs. Some building inspectors - at least in London - now expect to see such pipes fitted with a small trap when they leave the boiler, even though most condensing boilers already have an internal condensate trapping device.

  Terry Brown 09:28 19 Dec 2011

Thanks all for your input, the boiler I have selected,with advice from 3 different installer (quotations) is a Worcester Bosch 28 junior - My current one is a Glowworm 24, while adequate, you now have to run the taps slower to get a decent hot water.

The drain pipe it will be connected to is the output from the sink / washing machine and with the cold weather last year we had no problems at all, however I wil ask before it is done about the trace heater.

I hope to have this done in late January/ early february 2012.

Terry

  oresome 11:27 20 Dec 2011

17 years old...........it's barely out of nappies!

Having to run the taps slower to get hot water is probably due to the secondary heat exchanger scaling up.

I prefer a system boiler with hot water tank and back up immersion heater rather than a combi.

  Terry Brown 16:42 22 Dec 2011

In responce to enquiries, I have short listed a company called 'Eco Heat' , Have you had any dealings with them, if so- any comments (good or bad)

Thank you

Terry

  woodchip 16:54 24 Dec 2011

Do not forget that with a Comby boiler you do need good water pressure, as its only as good as that. its no good if its low pressure or a big house like mine. not forgetting that if your electric goes off you only have cold water. with a cylinder you at least have that full of hot water. low pressure like no hot water at the sink or bath if you have more than one tap running

  Terry Brown 20:29 27 Dec 2011

Romanby1

Thank s for the thought, however with our lifestyle we do not use water at regular times each day, and so to keep a tank of water hot 'in case' seems like a waste.

Correct me if I am wrong in thinking this way.

Terry

  Terry Brown 19:52 28 Dec 2011

We also live in a hard water area, however the people who we have (almost chosen) are putting in a chemical descaler (in the water) and installing a Magnaclean device which attracts and holds any residue (sludge)and needs to be emptied annually (like the ubend of a sink pipe),and that will be done for the first 7 years as part of the installation price, after that it is (currently) £67 (at todays prices) per time.

Thanks for your feedback

Terry

  Forum Editor 01:43 01 Jan 2012

"the people who we have (almost chosen) are putting in a chemical descaler (in the water)"

I hope not.

I think you'll find that what they are actually going to do is add a corrosion inhibitor to the sealed heating circuit. That's the water that is pumped through the boiler's heat exchanger, the radiators and associated pipework. In an ideal world the system should be drained and flushed once a year, and the corrosion inhibitor renewed.

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