Hi there,i have built a granny site at the end of my garden some 28 metre or 90 ffeet away from the boiler & looking to feed the 14000 btu double convector raditor in it with my ideal standard c32 combi boiler .I have ran the flow & return pipes under the ground & well foam insulated 25mm thick all around.How do i go on about installing a secondary circulating pump to my system ?How do i wire it up? Can i use a Grundfos ordinary circulating pump 6 metre?
Secondary ciculating pump
- Thread starter sidedward
- Start date
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Don't need the pump. Fit a zone valve on flow to granny, fit a room stat in granny. You will need to fit another zone valve with house's stat on existing heating for your house to stop it coming up when granny's stat calling for heat.
Don't think 25mm insulated is thick enough.
Have you thought about Stand alone radiator with build-in boiler and pump? Perfect for granny....
Daniel.
Don't think 25mm insulated is thick enough.
Have you thought about Stand alone radiator with build-in boiler and pump? Perfect for granny....
Daniel.
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Don't fit pump, the pump inside combi will do the work, fitting the pump may affect the performance of the boiler which already has the pump inside.
All you need is 2 zone valves, that's it.
Daniel.
All you need is 2 zone valves, that's it.
Daniel.
Comparison with multiple circulator pumps
Multiple zones can be implemented using either multiple, individually controlled circulator pumps or a single pump and multiple zone valves. Each approach has advantages and disadvantages.
Multiple pump system
Advantages:
Lower total cost of ownership when zone valve failure and repair costs are taken into account.
More robust and reliable system.
Simple mechanical and control design ("SPST thermostats")
Redundancy: If one zone pump fails, the others can remain working
Far superior method of linking multiple heat sources. Such as gas and solid fuel in one system.
Disadvantages:
Higher initial installation cost. Circulator pumps cost more than zone valves
Higher power consumption. Operating circulators draw more power any time the zone is actively heating. Zone valves, by comparison, draw little power at any time and many designs only draw power while in transition from open to close or vice-versa.
Zone valve system
Advantages:
Lower initial installation cost.
Lower power consumption.
Ease of maintenance certain models.
Disadvantages:
Zone valves are inherently more unreliable and prone to a very high failure rate. Zone valves operated by electric timing motors aren't "fail safe" (failing to the "open" condition).
No inherent redundancy for the pump. A zone-valved system is dependent upon a single circulator pump. If it fails, the system becomes completely inoperable.
The system can be harder to design, requiring both "SPDT" thermostats or relays and the ability of the system to withstand the fault condition whereby all zone valves are closed simultaneously.
Zone valve system
Advantages:
Lower initial installation cost.
Lower power consumption.
Ease of maintenance certain models.
Disadvantages:
Zone valves are inherently more unreliable and prone to a very high failure rate. Zone valves operated by electric timing motors aren't "fail safe" (failing to the "open" condition).
No inherent redundancy for the pump. A zone-valved system is dependent upon a single circulator pump. If it fails, the system becomes completely inoperable.
The system can be harder to design, requiring both "SPDT" thermostats or relays and the ability of the system to withstand the fault condition whereby all zone valves are closed simultaneously.
Multiple zones can be implemented using either multiple, individually controlled circulator pumps or a single pump and multiple zone valves. Each approach has advantages and disadvantages.
Multiple pump system
Advantages:
Lower total cost of ownership when zone valve failure and repair costs are taken into account.
More robust and reliable system.
Simple mechanical and control design ("SPST thermostats")
Redundancy: If one zone pump fails, the others can remain working
Far superior method of linking multiple heat sources. Such as gas and solid fuel in one system.
Disadvantages:
Higher initial installation cost. Circulator pumps cost more than zone valves
Higher power consumption. Operating circulators draw more power any time the zone is actively heating. Zone valves, by comparison, draw little power at any time and many designs only draw power while in transition from open to close or vice-versa.
Zone valve system
Advantages:
Lower initial installation cost.
Lower power consumption.
Ease of maintenance certain models.
Disadvantages:
Zone valves are inherently more unreliable and prone to a very high failure rate. Zone valves operated by electric timing motors aren't "fail safe" (failing to the "open" condition).
No inherent redundancy for the pump. A zone-valved system is dependent upon a single circulator pump. If it fails, the system becomes completely inoperable.
The system can be harder to design, requiring both "SPDT" thermostats or relays and the ability of the system to withstand the fault condition whereby all zone valves are closed simultaneously.
Zone valve system
Advantages:
Lower initial installation cost.
Lower power consumption.
Ease of maintenance certain models.
Disadvantages:
Zone valves are inherently more unreliable and prone to a very high failure rate. Zone valves operated by electric timing motors aren't "fail safe" (failing to the "open" condition).
No inherent redundancy for the pump. A zone-valved system is dependent upon a single circulator pump. If it fails, the system becomes completely inoperable.
The system can be harder to design, requiring both "SPDT" thermostats or relays and the ability of the system to withstand the fault condition whereby all zone valves are closed simultaneously.
We know, but it's not just a case of throwing a pump onto the system. If you've got your heart set on using pumps instead of zone valves, you would probably need to install an open bypass for the boiler with the granny site fed by 1 pump and the existing system controlled by another pump. So that's pump inside boiler, plus alterations to some pipework, plus 2 new pumps.
James.
Use a plate heat exchanger to run your granny flat, if you want to heat the flat independantly ie heat the flat on its own you would need a 2 port valve or check valves and a relay, its just easier with a two port valve.
Edit
This is the kind of thing you should be using:
http://www.treco.co.uk/assets/technical/PreInsulated_Tech_Guide_Jan_2012.pdf
Piping through the ground with some wrap-round foam is going to throw out tonnes of heat. Look at this page for examples. It will be even worse underground as conduction will drive a lot of the heat away.
http://www.treco.co.uk/assets/technical/PreInsulated_Tech_Guide_Jan_2012.pdf
Piping through the ground with some wrap-round foam is going to throw out tonnes of heat. Look at this page for examples. It will be even worse underground as conduction will drive a lot of the heat away.
Good links - but you`ve confused me
is that metric tonnes of heat KW - or imperial tons BTU`s DIYnot Local
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