Heat Only Boiler

[enfable]

Hi all,

I am looking at getting a new boiler and was wondering if a heat only one would be a better option for me as opposed to a combi? I have a 3.99kw solar panel system and all my showers are electric. washing machine is cold water fill.

Property is detached, double glazed, has cavity wall insulation and 750mm loft insulation.

I will have about a 12 - 14 radiators (I am planning to convert my garage in the future and would like to allow for this).

I have used this website http://www.idhee.org.uk/calculator.html but can not believe that the Kw I require would be under 7Kw. Is this right?

Not sure where to post so have posted also in How it Works.

[BRIGHT SPARK]

You can still have a combi and only use the hot water when needed.If you have a conventional boiler you will surely still need some hot water and so will need a hot water cylinder.The calculation for the radiators takes into account their size.On average 13 radiators would require around 35kW.
We have 15 and have a 52kW boiler.

[enfable]

My current system is over 20 years old and does not have a combi so everything is in place for a heat only bolier. My main concer was adding additional radiators to the system and wondered if an extra 2 - 3 radiators would be offset by the addition of double glazing, cavity & loft insulation. Given that boilers are now more efficient I was wondering what Kw I would require. My current boiler is an Ideal Mexico Super 2 but I can not see how many Kw it is. Is is more than sufficient for the current set up but I will be adding, in time, 2-3 more radiators.

[BRIGHT SPARK]

Which model is it ...the CF100...(mid range) ........has a max output of 29.3kW

[enfable]

Hi Bright Spark I think it is an RS 60. Does that mean 60.000 BTU's?

[BRIGHT SPARK]

If its 60,000Btu then that equates to about 18kW

[BRIGHT SPARK]

The RS60p has a max output of 17.4kW.

[enfable]

Thank you for your help.

I presume that if I divied the Mexico Kw by the number of radiators I have (plus 1 to be on the safe side) and then multiple by the maximum number I intend having in the long run it should give me an approximate KW I need,
Have had 2 people come to quote so far one said 30-35Kw only other said 24Kw would be sufficient. I am awaiting prices from both.
One has suggested a combi and the other a combi or system boiler. Neither like the idea of a heat only but the one who said I could use a system boiler was on about not linking in to the hot water and putting in a new immersion heater.
All very confusing to me.

[BRIGHT SPARK]

We have fitted a few of the new Ideal Vogue boilers...they are very good since Ideal had a good kick up the backside a few years ago.They have stainless steel heat exchangers which is a must have in my book.I would go for the 35kW with a feed to the DHW tank AND an immersion...you can use it during the day from your solar.

[BRIGHT SPARK]

I forgot to add...the Vogue has a 10 year manufacturers warranty.

[enfable]

That's great thank you.

They have all said Worcester or Gloworm.