Germination Issues?

What kind of heated propagator do you have? Is it thermostatically controlled? What's the ambient temperature of the room it's in? How high above ambient is it supposed to raise the temperature? (It could be anything between 8 and 12 degrees, depending on the model.)

I ask these questions not as an expert, but as someone who has had patchy success in the past and wants to up her game this year!

Edit: I know you asked about watering, but knowing your setup might help with answers

Hiya Eyren

I'm not sure about the ambient temperature of the room but the product description states - This unit is not thermostatically controlled and is designed to increase the ambient compost temperature by around 8°C.

I originally had it sitting on the windowsill with a radiator underneath, the soil was looking very dry so I re-sowed and moved it to a location away from the window to see if that would help.

That's about all I've got really.