J
jbolland
Hi,
I'd like advice on best way to incorporate these 3 heating options. I've ruled out a 3-coil cylinder on cost grounds. I'm also aware of the regulations on woodburners and unvented cylinders.
I'm looking at 2 options, each with 2 cylinders.
In option 1, the twin coil (DHW)cylinder accepts heat from the woodburner and the ASHP, and the single coil cylinder accepts heat from the solar heater.
In summer with no woodburner, the solar heat is transferred to the DHW. I can see there will be an efficiency loss, but the cylinders will be adjacent so maybe not too bad. When the ASHP is on, residual heat after the underfloor heating will pass to the solar cylinder and act as a heat store. I'll set the solar cylinder thermostat at 50C so that up to 50C, the heat pump circuit pumps, and over 50C the heat store circuit pumps.
In option 2, the woodburner feeds the single coil cylinder (as well as the radiators). Heat for DHW is pumped across. Again there will be an efficiency loss.
I'd like opinions on what would be the better option, and also if there are any other methods. My 2 pdf files are 13kb each, so I'll post the second one separately - I hope this is OK
I'd like advice on best way to incorporate these 3 heating options. I've ruled out a 3-coil cylinder on cost grounds. I'm also aware of the regulations on woodburners and unvented cylinders.
I'm looking at 2 options, each with 2 cylinders.
In option 1, the twin coil (DHW)cylinder accepts heat from the woodburner and the ASHP, and the single coil cylinder accepts heat from the solar heater.
In summer with no woodburner, the solar heat is transferred to the DHW. I can see there will be an efficiency loss, but the cylinders will be adjacent so maybe not too bad. When the ASHP is on, residual heat after the underfloor heating will pass to the solar cylinder and act as a heat store. I'll set the solar cylinder thermostat at 50C so that up to 50C, the heat pump circuit pumps, and over 50C the heat store circuit pumps.
In option 2, the woodburner feeds the single coil cylinder (as well as the radiators). Heat for DHW is pumped across. Again there will be an efficiency loss.
I'd like opinions on what would be the better option, and also if there are any other methods. My 2 pdf files are 13kb each, so I'll post the second one separately - I hope this is OK