Which Combi

[gmac]

Currently working on a shop fit and they're looking to install a gas combi but are finding funding tight, only going to be running 2 radiators and 1 sink and 1 whb. Gas men in next week to connect appliances and the boiler which I'm supplying. Now not knowing too much about gas boilers was looking info on which boiler to go.

Local merchant trying to push the ariston e-combi 30 and another the vokera compact 29.

Which would you guys go for ?? bearing in mind trying to keep costs down

 

[diamondgas]

Hi gmac, you should get the warranty period out of either to be honest. Why not ask the guy's who are fitting it? End of the day they'll be the ones you're relying on and they may have a preferred boiler withing your budget!

 

[gmac]

Hi gmac, you should get the warranty period out of either to be honest. Why not ask the guy's who are fitting it? End of the day they'll be the ones you're relying on and they may have a preferred boiler withing your budget!

I have done, They stated they would only recommend a valliant or wb been quoted a bit of price difference between them and the ones mentioned in origional post, customer made aware that basically you get for what you pay for in the boiler world and quite happy to go cheap to get up and running with the view of upgrading in the future.
Can get what I believe to be a very good deal on the vokera.
Also will the 29kw be reasonable enough to supply the hw or would it be safer putting in a higher kw boiler, meeting the gas guys tomorrow and would prefer some impartial advice on the matter as gas really isn't my thing.

 

[diamondgas]

gmac, personally what you say is true, "get for what you pay for", but can best be associated with installers, THEN boilers IMO! In my experience it's been poor workmanship or attention to manufacturers recommendations that leads to boilers breaking down prematurely. I tend to think the more expensive appliances have maybe been designed with more 'tolerant' to muck components! Who knows. Put a Vokera on a well cleaned out and inhibited system will work merely!

29kW will give plenty hot water ...

I'm sure ther'll be some who reply that'll dispute this *shrug* ... This is of course my opinion ..... 🙂

 

[GQuigley67]

fit a potterton boiler, stainless steel heat exchangers and reasonable price imho

 

[metaldust9]

if ye going for cheapness id go for the forroli optimax has a 5 yr guarentee my mates been fitting them for yrs and very few comebacks ,wouldnt fit any other forrolli tho only £499 plus vat otherwise id go for baxi all day long

 

[Davinder]

Is it just me, or is a 29/30KW boiler to supply hot water to 1 sink and 1 wash hand basin a bit overkill?

 

[mylesy]

you need to take a flow rate really and cater for it accordingly. cheap boiler ideal esprit 2 mid range glowworm and vaillant or worcester at top end. just make sure its A rated.

 

[GQuigley67]

24kw would be overkill lol

 

[diamondgas]

Is it just me, or is a 29/30KW boiler to supply hot water to 1 sink and 1 wash hand basin a bit overkill?

Honestly mate???? It's you! lol

whenever sizing and guaranteeing hot water you got to check out your supply first. What's the point of putting 24kW-9ltr/min on a 30ltr/min supply? Even with the flow restrictors there's a damn good chance your gonna be called back in winter coz "the hot water ain't hot enough"! IMHO

 

[woodsy]

The Vokera is a decent boiler for the probable cost.

 

[gmac]

Honestly mate???? It's you! lol

whenever sizing and guaranteeing hot water you got to check out your supply first. What's the point of putting 24kW-9ltr/min on a 30ltr/min supply? Even with the flow restrictors there's a damn good chance your gonna be called back in winter coz "the hot water ain't hot enough"! IMHO

Read a thread on here a while back regarding the kw-age of combi boilers and recall that bein the same argument at the time, and the general outcome on that thread if i remember correct was as you say diamondgas regarding the ability of the boiler to heat effectivley in the winter, hence the 29kw

 

[diamondgas]

Read a thread on here a while back regarding the kw-age of combi boilers and recall that bein the same argument at the time, and the general outcome on that thread if i remember correct was as you say diamondgas regarding the ability of the boiler to heat effectivley in the winter, hence the 29kw

gmac .. Honestly mate I've worked long enough in the repair and call back field of this industry to know where a lot of the problems lie! From the introduction of the combi design to today it hasn't changed! Lower rated boilers struggle to suply hot water in the winter! 🙂

 

[mylesy]

Some boilers have no thermostat on hot water, and just raise the water temp by a certain amount, which will feel colder in winter for obvious reasons. However some boilers will heat it too a certain temp, usually ones with a thermostat. Kw tend to be just how many litres a min it can heat.

 

[diamondgas]

Some boilers have no thermostat on hot water, and just raise the water temp by a certain amount, which will feel colder in winter for obvious reasons. However some boilers will heat it too a certain temp, usually ones with a thermostat. Kw tend to be just how many litres a min it can heat.

Hi mylesy ... If you check out the mi's of all manufacturers they'll quote you a temp rise at a certain Ltr/min flow rate. The user control gives you the option to adjust that but will not guarantee hot water. The temp of the cold coming in, the amount of water flowing through the plate hex and the amount of heat available determine how hot the water will be. All manufactureres quote their specifications on raising the cold by 35 DegC. The smaller the output the less flow rate it'll guarantee raising by 35 degC as you say. End of the day though you're customer wants to feel hot water coming out of their taps all year round! When the cold gets down to 8/9DegC in the winter the boiler will only guarantee 44/45DegC at the taps. You can keep your hand under that sort of temp. Whilst in the summer with the cold 5 degC or so warmer the hot water is then delivered at 50+, too hot to put your hand under! Custy thinks there's something wrong with the boiler in the winter coz the waters 'gone cold'! In my experience the way to reduce the chance of a disapointed custard is to over size the supply of heat for the water to compensate for the drop in cold mains temp in the winter!

 

[mylesy]

I agree 😉

 

[stevetheplumber]

horses for courses most shops will hardly use the hot water so a 24kw is going to be adequate for comfort levels in a domestic situation i always spec 28kw miminmum

 

[gasmarc]

a 24kw boiler is ample for any sink and basin anything else is over kill ,personally I would go for an intergas all the others are rubbish IMHO

 

[gmac]

horses for courses most shops will hardly use the hot water so a 24kw is going to be adequate for comfort levels in a domestic situation i always spec 28kw miminmum

Should have noted in op, it's a take away and hw will be in great demand, obviously depending how good their food is of course

 

[arran197]

Baxi Duo Tec. Easy to work on and parts are easy to come by. Fault diagnosis is a doddle because of the fault codes. They do 28kw and I THINK??? they are doing a 5 year warranty now.

 

[gasmarc]

any decent make should do a 5 year guarantee minimum