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Post by battle1066 on Sept 14, 2018 20:42:23 GMT
Evening All - what's your thoughts on the 40CDI (conventional boiler to be unvented with expansion vessel etc) running with A Grundfos Alpha 15/60 pump for 4 bed house with 1 bath two shower using 200 Ltr Megaflow (unvented) as an upgrade from Glow Worm 80FF vented system with Accolade 175 Ltr unvented domestic system please?
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Post by tomplum on Sept 14, 2018 21:31:43 GMT
I'm not well up on unvented battle but. I know megaflow are a quality product, you've upgraded the boiler output and the storage capacity so I don't see any problems there,  |
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Post by crowsfoot on Sept 15, 2018 6:50:52 GMT
The ones that I mainly work on are the Kingspan unvented range.
With the odd megaflow unvented now and then turning up (they have the internal diaphragm). -
Kingspan have the external pressure vessel (which to be fair we do get called to quite a lot).
It all sounds OK to me battle.
The main thing to look for at the start is that the cold mains pressure needs to be above 1.5 bar with a flow rate of at least 20L/M before any thoughts of fitting an unvented set up are entertained.
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Post by dickpuller on Sept 15, 2018 8:29:48 GMT
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Post by woodbine66 on Sept 15, 2018 16:38:53 GMT
That must be a big place for 40 Kw.
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Post by boilerdoktor on Sept 15, 2018 17:55:08 GMT
Hi battle good choice of boiler and pump. When you consider the average shower is 90 litres 3 x 9 = 27 ( 270 litres )
if theres not much chance of all three showers on at the same time stick with 200 otherwise go a bit bigger. How many zones on the heating side? Is it worth considering a low loss header ?
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Post by battle1066 on Sept 15, 2018 18:34:24 GMT
Hi battle good choice of boiler and pump. When you consider the average shower is 90 litres 3 x 9 = 27 ( 270 litres ) if theres not much chance of all three showers on at the same time stick with 200 otherwise go a bit bigger. How many zones on the heating side? Is it worth considering a low loss header ? It's just an S plan with no multiple zoning. I thought those low loss header where used for connecting two boilers in series - only seen one set up in a commercial factory with a warehouse and offices? |
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Post by battle1066 on Sept 15, 2018 18:37:07 GMT
That must be a big place for 40 Kw. House full of professionals - the type always showering and rather than put a jumper on, they turn the heating up to eventually take another garment off - crazy type! |
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Post by dickpuller on Sept 15, 2018 18:38:33 GMT
I’d say we need more details, after all, there could be two electric showers.
Normal lifestyle of a young family; parents Shower in the morning in an en-suite, which is electric. Kids get a Bath in the evening.
So a big Combi would be more than enough to cover hot water needs.
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Post by battle1066 on Sept 15, 2018 18:51:33 GMT
I’d say we need more details, after all, there could be two electric showers. Normal lifestyle of a young family; parents Shower in the morning in an en-suite, which is electric. Kids get a Bath in the evening. So a big Combi would be more than enough to cover hot water needs. A very fair request Dick - this is the set up I saw:- A typical professional family with three children, all adults but not looking to leave home type (well tucked up) never out of their showers - all showers run from the existing regular boiler system and unvented water tank. |
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Post by boilerdoktor on Sept 15, 2018 18:56:05 GMT
I would personally only ever fit a combi in a flat or small house with one bathroom. They are useless. I’m not a fan
low loss headers are advised and used on multi circuits of one boiler.....such as 2-3 heating zones and hot water. I see them a lot and also external plate heat exchangers. I’ll try and find some info on llh if it’s any use at all
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Post by dickpuller on Sept 16, 2018 14:16:09 GMT
I would personally only ever fit a combi in a flat or small house with one bathroom. They are useless. I’m not a fan low loss headers are advised and used on multi circuits of one boiler.....such as 2-3 heating zones and hot water. I see them a lot and also external plate heat exchangers. I’ll try and find some info on llh if it’s any use at all BD you need to get away from these German shite boxes. Combis are amazing now!! I’ve had 16Ltr/Min from an Intergas Rapid 32, amazing Flow Rates!! The Ideal Vogue 40 too outdoes the MI’s performance data details, a wonderful appliance. Whoofter Botch are shite. I do a lot of New Build & we commonly sling in the Ideal Logic 35, you can literally fit them in half an hour, granted we fit a lot & could fit them with our eyes closed. When I first fitted one I thought ‘hmmmm....standard set-up, Secondary SS plate heat exchanger etc, it’ll be pretty piss poor hot water wise’. How wrong I was!! I’ve had the cloakroom basin, the Bath hot & the shower running too. Fucking amazing unit!! Another boiler that’s getting rave reviews performance & reliably wise is the Ferroli Modena👍👍 Just as a wee footnote & tips if anyone that is replacing boilers & vented HW cylinders, with a Combi. The Intergas Rapid Combi can be fitted open vented or sealed at a very low pressure. When you go to price the job, show the punter the flow rate of their existing open vented cylinder system, use a Weir Cup. You’d be amazed how low the pressure is & how a cheapo 24KW Combi will look amazing Flow Rate wise. More money in your pocket mateys & a happy customer. Don’t work hard, work smart👍👍👍 |
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Post by woodbine66 on Sept 17, 2018 13:02:33 GMT
Ferroli Modena suspitious
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Post by dickpuller on Sept 17, 2018 17:22:09 GMT
Ferroli Modena 
Four moving parts & other amazing features; |
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Post by crowsfoot on Sept 18, 2018 6:19:40 GMT
New modulating pump regulations came into force in 2015?
Familiarity with a product always plays a big part in preferences.
i.e. if you know a boiler like the back of your hand you're always going to prefer that one to one that you don't.
Looks a simple enough boiler to maintain though dick.
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