Description

Pump Station – Boiler Charging Station

The pump station enables the back boiler in a wood burning stove to reach it’s optimum operating temperature quickly, which will ensure that the boiler delivers a longer service life, whilst at the same time enhancing the performance and efficiency of both your stove and the back boiler thus providing hot water more rapidly.

The pump station is designed to be connected in close proximity of the stove, in-line with the flow and return pipes from the back boiler. The intention is to create a short loop of pipework between the stove and the pump station in order to rapidly heat the water that the loop contains. Once the water reaches 60 degree the pump station will release the water from the short loop in to the main central heating pipework. Both the flow and the return on the pump station incorporate separate temperature gauges to allow the user to identify the temperature of the flow and return water.

The pump station incorporates an electric circulation pump on the return water flow, which can be manually altered to adjust the flow rate over 3 separate speeds.

The pump station has a bypass valve to enable it to redirect the hot water back in to the back boiler until the water becomes hot enough to allow it to flow away from the pump station. This reduces the warm up time of the hot water and increases the efficiency of the back boiler and the stove. The bypass is controlled by an integrated thermal valve, which closes when the water is initially cold, to return the water to the back boiler, this continues whilst the water is at a low temperature.

Once the water reaches the desired temperature (e.g 60C) the integrated thermal valve opens to gradually divert the water in to the heating circuit. If the water temperature falls below 60 degrees, the process is reversed and the valve will close to divert the water back to the back boiler of the stove until the optimum temperature of 60 degrees is achieved. 

How it can increase the efficiency of your back boiler stove :-
When the fire is first lit the back boiler contains cold water, which is heated by the fire. The water is then pumped away from the back boiler and to the consumer, i.e. a radiator or a hot water storage tank. As the water is pumped away from the back boiler towards the pump station, it is replaced with cold water from the return pipe, which is then heated in the back boiler and so the process goes on, of cold water entering the back boiler and being heated by the fire.

The result is that for a reasonable period of time the back boiler is always being fed with cold water, which makes it difficult for the stove to bring the water up to the desired temperature. Even the first body of water will have cooled down by the time it has been passed around the hot water pipe work, and therefore it requires constant re-heating.

Furthermore the cooling effect on the inside of the stove firebox can lead to carbon deposits lining the outer wall of the back boiler, thus insulating the water inside the back boiler from the heat and flames of the fire, which is the opposite of the desired intention of a back boiler in a stove.

The temperature load valve is designed to be connected in line with the flow and return pipe-work from the back boiler. The load valve will monitor the temperature of the water that has been heated by the back boiler, and if the water is not at 60 degree C, it will immediately return the water to the back boiler for re-heating, thus ensuring that only water above 60 degree C is allowed to flow to the consumer. The result is that the back boiler is given the opportunity to reach it’s optimum temperature more quickly, and the heating of the water to it’s optimum temperature is done more quickly. In addition, because the back boiler can reach its optimum temperature more quickly there is less opportunity for carbon deposits to line the outer wall of the back boiler. 

Phase 1. When the fire is first lit the water inside the back boiler is cold. The thermal load valve is in its closed position diverting the water back to the return flow of the back boiler to be re-heated. The valve remains closed until the water has reached the opening temperature of the thermal load valve (e.g 60C). This allows the water to reach its optimum temperature more quickly and increase the efficiency of the stove.

Phase 2. Transition Phase – When the opening temperature is reached.  – When the opening temperature is reached (e.g. 60C) the circuit to the consumer is opened to allow the hot water to pass to the consumer.

Phase 3. Normal Operation (When temperature is reached). The water temperature will increase until the thermal valve is fully open, thus allowing the hot water to freely pass to the consumer, and the bypass valve is fully closed accordingly. If the water temperature subsequently drops 10C below the opening temperature (e.g. 60C) then the bypass valve will open proportionally.

For those who are familiar with the cooling system on a car engine, the process is the same in the sense that the load valve passes the water immediately back to the back boiler, for a re-heat, the process is repeated until the water reaches 60C.

The electric circulation pump can be controlled (on or off) by a thermostatic control switch called a pipe stat, (pipe stat is not included) which is normally mounted either on the back of the stove, or on the flow pipework adjacent to the stove. Once the pipe stat detects the water is heating up, it will then automatically trigger the pump to start, and when it detects that the water has cooled down it will turn off the circulation plump. 

Specifications:-
Pre Set Thermostatic Switch 58 degrees C (+/-2)
Maximum operating temperature 90 degrees
Minimum operating temperature -20 degrees
Maximum operating pressure 10bar
Suitable for Vented or Un-Vented heating / hot water system
Wall Mounting

Dimensions: Width 250mm, Height 450mm, Depth 150mm
Flow and Return connections are spaced 125mm apart
4 x Pipe Connections = 28mm  

Please note that we sell all types of flue pipe and fittings. We also offer a free chimney and flue pipe design and quotation service..

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