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I have a Gerkross 30kw pellet boiler heating a UFH system via a tank in tank buffer tank. The internal DHW tank is 250L plus another 300L as buffer. The boiler has a Laddomat 10 fitted with a 52deg C thermostat and the tank has a mixing thermostat so that the DHW is 50 deg C. The tank has two thermostats one at the UFH outlet the other at the UFH inlet. These turn the boiler and its pump on an off via a relay which allows the boiler to run until both thermostats are satisified an not to run until both thermostats are unsatisfied. This is to try and prevent boiler cycling. The UFH flow is 48degC and return 40degC controlled by a mixing valve on each of the two manifolds. The building is a new build bungalow of 2500 sq ft.
The tank has the DWH in and out at the top, with 5 outlets/inlets down the side and 2 for the solar coil at the bottom
1) I think that the connections to the tank are in the wrong place, the flow and return of the UFH are either side of the boiler return half way down the tank so despite the relay the the boiler is running nearly all the time. My pellet usage is 2 tonnes per month equiv to 1000L of oil.
2) What temperature should the Laddomat 10 thermostat be. I also have a 72degC one.
3) What temperature should the boiler be set at and also the tank thermostats.
[wiki][/wiki]
The tank has the DWH in and out at the top, with 5 outlets/inlets down the side and 2 for the solar coil at the bottom
1) I think that the connections to the tank are in the wrong place, the flow and return of the UFH are either side of the boiler return half way down the tank so despite the relay the the boiler is running nearly all the time. My pellet usage is 2 tonnes per month equiv to 1000L of oil.
2) What temperature should the Laddomat 10 thermostat be. I also have a 72degC one.
3) What temperature should the boiler be set at and also the tank thermostats.
[wiki][/wiki]