dripping temperature/pressure relief valve

Hello All,
I have a constantly dripping (verging on constant leaking) TP valve on my hot water heater.

I have replaced the TP valve, and have verified that the thermostat is working and the water temperature is not crazy. I have also replaced the pressure limiter on the cold water inlet. Is still leaks, and is getting worse.

I measured the pressure on my water supply recently - it's at 800kPa. Pretty high I think. Still, the pressure limiter on my hot water tank input is rated up to 2000KPa, and limits to 500kPa. The Pressure relief valve should open at 1000kPa.

Should I put a pressure limiter on my entire house? The pressure is pretty crazy at all my taps. Is the heater dripping because the pressure limiter is a one-way valve? How can I stop it dripping?

any advice welcome,
dave

Addition...
OK after more checks I'm pretty sure I need an expansion tank after the pressure limiter, although I'm not quite sure why the tank was put in without one (it's only 5-10 years old and I suspect it breaks Oz regulations?). Should I put a limiter on my entire house and a expansion tank, or just on the hot water tank? I have no non-return valve on my house water supply.


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