Condensing Boiler questions

[mungoh]

Hi Folks, I'm now at the "tendering" stage of my boiler replacement and I'm shopping around for a new 40Kw condensing boiler (not a combi boiler).

The current boiler of choice is a "Greenstar HE 40 open system boiler", so a quick Google on some of these words has illustrated "Discounted Heating" at

got experience of these folk?

They have a couple of Greenstar boilers but the one I think I am interested in has the acronym "RSF" tacked on to the name and I don't recognise what this means (some sort of "flue" specification? Dunno).

I've also been told that I will need some sort of "programmer". Since I

already have a timeswitch (now only for the hot water) and I fitted a programmable thermostat a couple of years ago I am questioning what exactly this programmer will do for me - is it essential, desirable or redundant?

Any help appreciated; thanks in advance

Mungo

[fred]

In article , [e-mail] writes

I used them to buy all my CH bits a couple of years ago and found them to be good, but they were growing rapidly and I felt that customer service was slipping a little. I had a small problem and emails were taking a little while to get answered but a phone call sorted the problem to my satisfaction with little fuss. So, good guys, but maybe call first to discuss your requirements and to sound them out. Be aware that they usually supply though Plumbcentre, they buy millions of quids worth a year and so get huge discounts then pass on most of it to us; means that they have access to their huge stocks and delivery is from your nearest depot, usually delivered at trade times of 8-10am rather than the wait in all day approach for Screwfix et al.

Room Sealed Flue, the universal term for balanced flue or fan assisted flue where intake air and exhaust are taken from and vented to the outside; the safest form. cf. Conventional flue where combustion air is drawn from the room in which the boiler is located and precautions need to be taken to ensure there is adequate ventilation.

I've used a proprietary control system so will pass on this one, I'm sure others will fill you in on their favourites.

[John]

"Room Sealed, Fanned" flue

AIUI You are "required" to have independant time and temperature control of hot water and heating. If your hot water is controlled by your timer AND a thermostat on the cylinder, plus a programmable thermostat looking after your heating with both interlocked with the boiler so as to prevent the boiler running when neither are calling then you should be OK

[Ed Sirett]

As of now replacement boilers must comply with Part-L. This is much like Part-P i.e. only those of us in the various 'guilds' can sign off the installation as compliant. Others have to submit building notices.

Anyway to comply with the regs you will need a control system that provided independent time and temperature controls for both heating and HW. and both the heating and HW will be thermostatically controlled.

You can do this anyway you like using existing and new parts as needed.

My preferred way is a simple timer for the HW and tank stat of course and a programmable thermostat for the heating.