No probs...
Here are a couple of tips too when wanting to use it with a wfp pump.
1. On the heater check and turn the flow setting all the way down to min
2. Turn on the ignition switch (underneath)
3. Turn on the gas.
4. If using a digi pump flow controller turn it on and adjust the flow to about 50 so the heater can detect enough flow to be able to fire up.
5. If using a tap etc on yer pole this has to be open too as the heater will cut out if it doesn’t detect a water flow rate
6. Now the heater should fire up.
7. Those type heaters also have twin burners so have a winter and summer setting. I leave mine on summer as found no need to use it on winter setting what with a wfp pump flow rate being much less that using a water mains feed (connected to an outside tap).