That is equiv to 22mm. I assume you have decent flow and pressure. Flow is easy to gauge by filling a bucket and timing it. Pipe up as I described.
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Intergas xtreme 36 ok?
- Thread starter bobbidill
- Start date
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As I wrote, you need to get up to speed about aerated Raindance showers and how mains pressure systems are piped up. You are nearly there. The Raindance has a 9/litre/min drencher shower head. I personally used one and it is very good indeed surprising me. No drenchers have skin tingling performance.
https://www.rsfbathrooms.co.uk/Onli...i9vVupNbxbt5hrwhqhLwEn_v5OEuVVdxoC8rYQAvD_BwE
The 9 litres/min Raindance drencher. Yes 9 litres/min:
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Manifolds are used in new builds in France. They acts as balancing the system and quicker HW to taps as the pipe can be 10mm to kitchen and basins. Each pipe from the manifold can be flow regulated at the manifold and isolated if need be. You can do without manifolds of course (they may take up space), however the pipes will need to be a generally larger bore.
With two combis you divide and rule. Two combis gives simple zoning. In your case you could have one doing UFH only, set to say 45C flow temp for the floors, which would be running very efficiently being at a low temp. The other, the rest of the upstairs rads, set to a higher flow temp of 60C or so. Simple.
Have one combi do one bathroom, one the other. Simple. However, join the DHW outlets of both combis for the bath taps (using check valves so one combi does not influence or backfeed on the other) - filling the bath will have both combis full on. When having a shower in one bathroom, anyone having a shower in the other is not affected.
http://www.builderdepot.co.uk/inter...qdKC_LbNvNvF1KwnIW71RrnqssZOGItgaAjmSEALw_wcB
Inc VAT: £590.40, for two double it of course. Could get a deal with the supplier for buying two. No expensive space consuming extras such as cylinder stats, zone valves and all the associated pipework. The Intergas Rapid comes with integrated time clock and even weather compensation if you want to use it. So the UFH can be on and the rads off, and they can come on and off at different times being independent of each other. Multiple combis is perfectly suited for your requirements.
Doing it this way you divide and rule. You are eliminating complexity.
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And with 2 combis you can double your maintenence costs 
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Dannyboy this has already been addressed. The Intergas only has four moving parts. The running costs in gas bills will be lower, as one combi will be running at very low highly efficient temps.
A 145 litre megaflo unvented cylinder, which is not an option here, costs more than a 25kW Intergas Rapid, then the zone valves, piping, wiring, etc, on top as well - and they need an annual service which costs. So two services.
https://www.screwfix.com/p/heatrae-...ented-hot-water-cylinder-145ltr-2-x-3kw/987fp
A 145 litre megaflo unvented cylinder, which is not an option here, costs more than a 25kW Intergas Rapid, then the zone valves, piping, wiring, etc, on top as well - and they need an annual service which costs. So two services.
https://www.screwfix.com/p/heatrae-...ented-hot-water-cylinder-145ltr-2-x-3kw/987fp
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You are still doubling your maintenence costs you idiot.
He could go for a higher flow rate wall mounted stored water combi (they tend to be big!). However more complexity, space taking, and expense of zoning valves, etc. I would go for the two combis, as they naturally fall into UFH and rads for each combi, and one each does a bathroom each as well. Simple to fit and design as essentially two independent simple systems. Divide and rule.
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Heating requirement less than 10kW as a design figure seems a bit sparse to me.
@bobbidill , as I mentioned before - no one can recommend anything feasible about your hot water to you without a base set of facts about what you want and what your mains will deliver, all the ideas up to now are based on supposition.
We're going to get hold of the hardware we need to do this and then we'll measure that static and dynamic flow and pressure. I'll post them later this week, once we have obtained them.
@bobbidill has given what he has and wants and does not want (an unvented cylinder), except his cold mains water flow rate and dynamic pressure, but gave the size of the main pipe which is a big one. Mains pressure systems are all dependent on the cold water mains and what it can deliver - that is a given prerequisite, that is obvious. However, with a 25mm cold water main I would be surprised if it was not fine at the point of entry to the property. It is piping it up properly from the entry point, however I gave a guide for that.
No supposition, as the details were given, just an assumption that the 25mm main pipe can deliver the flow, which the flow needs to be measured of course. One thing is clear is that plumbers cannot magically make space in a house to fit in large unvented cylinders.
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Ignore all the fluff on this thread and fit an Xtreme if you want the ultimate efficiency or I would personally go for an Xclusive 36kW The only thing missing is the flue gas recovery but it comes with ten years warranty.
Oh and HW all current Intergas boilers are capable of running twin temp zones and will control the switching between them - the new ones even accept two Opentherm inputs
Two boilers is a terrible idea...............
Oh and HW all current Intergas boilers are capable of running twin temp zones and will control the switching between them - the new ones even accept two Opentherm inputs
Two boilers is a terrible idea...............
At a DHW Flow Rate of ΔT 35°C litres/min = 13.50
Are you having a laugh! That is going to do two bathrooms is it? Struth! Then all the zone valves, piping and wiring you need to split the systems, which takes up spaces and gives complexity.
I hope you do not design systems. If you are attempting to push Intergas boilers, do not comment on these things as they will all run.
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No he hasn't, all that's established is that there is no space for an unvented
Nothing can be decided nor suggested correctly until flow and pressure is established ..... simples!
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