I am buying a wood pellet boiler and want to have mains pressure hot water. I have been told that with type of boiler you need a buffer tank so that the boiler will not cycle. I am also putting in underfloor heating and solar panels. What is the best type of tank? Is it better to have a buffer tank and a seperate DHW tank or is one tank like the DPS thermal heat bank GXV enough.
You only need a buffer tank if you're using a conventional cylinder, where the boiler heats the hot water cylinder via a coil.
If you use a heat bank/thermal store, it will work great without one - in fact, that arrangement is far better suited to this type of boiler.
On 22 Mar 2006 08:49:59 -0800 someone who may be " snipped-for-privacy@metronet.co.uk" wrote this:-
Wood burners do not run at a constant temperature and cannot be turned off in an instant like a gas boiler, thus there needs to be something able to absorb the variable heat it produces. It is gas and oil boilers that cycle and this is a problem as it wears the boiler out more quickly.
A heat bank is ideal for this application. It will absorb the heat from the wood burner and solar panels, which it will convert into instant hot water at mains pressure and water at the best temperature for underfloor heating. It will also provide water at the best temperature for radiators if you have any rooms where underfloor heating is not the best option.
Do you think that a DPS GXV heat bank is a good idea, or is abuffer store and separate DHW tank necessary?
Looking at DPS site they describe under the UFH section an injection pump that "injects" hot water from the hot upper portion of the tank into the lower cooler portion, but this option is not available in the Pandora wizard, just pump modulation.
As ther are 2 thermostats on the heat bank new hot water will not enter from the boiler until both are opened. Should these thermostats control the boiler, the boiler pump or both. ie if there is no heat demand how should the system be wired?
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