Central Heating Connection

Connect a heat exchanger

Platten_Waermetauscher-1_red.jpgA heat exchanger is recommended to keep the two systems - central heating and biomeiler - separate.

  1. The biomeiler system is based on long runs of PE pipe for the coil in the biomeiler and possibly the district heating pipe connection. PE pipe can draw oxygen which is not wanted in central heating systems.
  2. Freeze proving your system - is a good point to consider. The biomeiler system is external and in case the biomeiler has finished its heat generating life-cycle the water in the system could freeze and pipes could burst. This might suggest that the system should be secured against frost.
    On the other hand the system works continuously and should therefore not freeze will operational. It also needs to be rebuild about once a year and at these times some of the circulation water may be lost and could seep into the ground. Therefore it would be better if this was just water. Should the system be defunct it is recommended to drain the pipes.
    In any case with the heat exchanger the two systems are separated.
  3. Heat_exchanger_connection-01.jpgIt will also be better to have separate systems to reduce the pump size and to be able to link in other systems such as solar, heat pumps, wood boilers at any time in the future.

The heat exchanger should correspond to the heat output your require. Over-sizing the heat exchanger is not a problem, under-sizing would be. An over-sized heat exchanger will give you some comfort to increase your biomeiler later. An under-sized heat exchanger will transfer enough heat into your central heating system. Larger, over-sized heat exchanger will reduce pressure loss for the pump.
The heat exchanger will be connected to the flow and the return of your central heating; best straight into  the feeds from an existing boiler. Please add a flow restricting valve if the boiler is still in use to prevent boiler heat to enter the heat exchanger in order not to waste energy. You could use a motorised valve.
The heat exchanger should be located inside the house and should be well insulated.
If you use an indirect hot water storage (buffer) tank you may not need a heat exchanger as the buffer tank may have a heat exchanger build in.

Connect your biomeiler

You now need to connect your biomeiler to your heat exchanger. On short distances you may use standard central heating piping and isolate it well.

For longer runs we recommend the use of standardised "district / area heating" pipes. They come ready made with two pipes side-by-side, well insulated and protected to be buried in the ground or run over ground.

You might have alternative solutions in mind and we would be happy to discuss them - just add them to our forum or send us an email.

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