That is a very very good question... Yet to be answered with anything remotely accountable.
Two boilers
- Thread starter Justin Passing
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That is a very very good question... Yet to be answered with anything remotely accountable.
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The query about pumps came up when a LLH header was suggested. If say two Ecotec system boilers are fitted, they already have pumps inside. Would you use those as shunt pumps (I mean to just pump round the header)? Then there would need to be circulation pumps for the CH and HW. That's four, which causes hesitation - reasonable?
The only chest-puffing I see is gaswizzard asserting that I wouldn't understand "all the complications" - of this fairly limited question. If you can see an issue, then please state it, rather than posting just to be dismissive.
It's not like we have multiple temperature-controlled loops with 4-port valves all controlled by a weather compensated, load compensated feedforward adaptive PID boiler management system. (Though there are people on this forum competent to advise on those, in a way that's easy enough to understand.)
But I'm only asking about connecting two boilers together.
Dan your sentiments are appreciated. Maybe two 24kW boilers in parallel would be nearly as good as most options, and have the virtue of simplicity.
The only chest-puffing I see is gaswizzard asserting that I wouldn't understand "all the complications" - of this fairly limited question. If you can see an issue, then please state it, rather than posting just to be dismissive.
Why? what else would you be looking at? There's 28mm F&R on the CH, 22mm on the HW. Anything else?
It's not like we have multiple temperature-controlled loops with 4-port valves all controlled by a weather compensated, load compensated feedforward adaptive PID boiler management system. (Though there are people on this forum competent to advise on those, in a way that's easy enough to understand.)
But I'm only asking about connecting two boilers together.
Try me.
Dan your sentiments are appreciated. Maybe two 24kW boilers in parallel would be nearly as good as most options, and have the virtue of simplicity.
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The real issue of two boilers is how you integrated the controls into the system
cascading on the continent only really starts at 45 kws and above assuming you use proprietary controls, although you may be able to cascade two smaller ecotecs with the VR630.
But the 630 costs as much as a small boiler....
Viessmann vitodens boilers up to 35 kws can't be coherently cascaded.
If you take generic controls they won't optimise the boiler technology...its not uncommon to see cascaded boilers sitting there all day at full out put because the controls can't talk to the boiler....
cascading on the continent only really starts at 45 kws and above assuming you use proprietary controls, although you may be able to cascade two smaller ecotecs with the VR630.
But the 630 costs as much as a small boiler....
Viessmann vitodens boilers up to 35 kws can't be coherently cascaded.
If you take generic controls they won't optimise the boiler technology...its not uncommon to see cascaded boilers sitting there all day at full out put because the controls can't talk to the boiler....
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Thankyou - easy enough to understand...!
OK, so time to contact the manufacturer perhaps, to check whether a Vaillant 470 or 392 can be connected to two boilers. Perhaps with something set on the boilers so that at low loads only one runs.
OK, so time to contact the manufacturer perhaps, to check whether a Vaillant 470 or 392 can be connected to two boilers. Perhaps with something set on the boilers so that at low loads only one runs.
A
ALEC1
justin I am not seeing what the benefit of two boiler is...
perhaps you could go for a separate water heater if dhw usage is high
perhaps you could go for a separate water heater if dhw usage is high
Redundancy.... Backup... I can see where the OP is coming from.
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