This is about my uncle’s boiler. He recently got a Worcester Bosch 8000 Regular.
He’s thinking of getting a new cylinder which heats more quickly, and we were talking about PDHW. The manual is confusing because in a couple of places it talks about fitting a WB cylinder sensor to activate the HW button. But when I rang WB they said that is a mistake, and that the HW button has no function on the 8000 Regular. They said the button only works on the system version, and that PDHW can only be done with the system version, by fitting WB integral diverter valve and cylinder sensor. I’ve asked twice now and been told the same.
Anyway, there’s a short Youtube video of a gas engineer called Richard, from Mid Wales Plumbing & Heating Supplies (which I think is also the Intergas Shop), converting an 8000 regular to PDHW. The important bit seems to start at 1 min 38 secs. He says he’s fitted a 10k Ohm resistor where the cylinder sensor would go. Then he says something I don’t understand, along the lines of the boiler now thinks it’s 30 degrees. But having done this, he says PDHW is enabled, and can be controlled by any external controller.
He is using EvoHome, but he says any controller can be used. My uncle has an S-Plan with a normal cylinder thermostat. I’d like to know if this might be possible with my uncle’s set up. Here's a still from the video showing the resistor.
He’s thinking of getting a new cylinder which heats more quickly, and we were talking about PDHW. The manual is confusing because in a couple of places it talks about fitting a WB cylinder sensor to activate the HW button. But when I rang WB they said that is a mistake, and that the HW button has no function on the 8000 Regular. They said the button only works on the system version, and that PDHW can only be done with the system version, by fitting WB integral diverter valve and cylinder sensor. I’ve asked twice now and been told the same.
Anyway, there’s a short Youtube video of a gas engineer called Richard, from Mid Wales Plumbing & Heating Supplies (which I think is also the Intergas Shop), converting an 8000 regular to PDHW. The important bit seems to start at 1 min 38 secs. He says he’s fitted a 10k Ohm resistor where the cylinder sensor would go. Then he says something I don’t understand, along the lines of the boiler now thinks it’s 30 degrees. But having done this, he says PDHW is enabled, and can be controlled by any external controller.
He is using EvoHome, but he says any controller can be used. My uncle has an S-Plan with a normal cylinder thermostat. I’d like to know if this might be possible with my uncle’s set up. Here's a still from the video showing the resistor.
Last edited:
