Replacing heater tap with ball valve tap - use 1 or 2?

[pfillery]

It is summer. And it is hot in a Series 3. Too hot to have warm air from the heater blowing onto you, despite the cable operated tap being off. I have seen these taps replaced with a simple half inch ball valve tap available from plumbing suppliers, just turn it off in summer and turn it back on in winter. Question is, should I put one tap in or 2? One tap on the inlet side will stop the flow but a second one on the outlet side should isolate the system altogether. And will this effect my LPG at all (water needed to operate).

I'm sure the heater circuit is seperate to the lpg circuit (on the same as the manifold heater) so hopefully not an issue.

It is on a 186 BTW!

[bee utey]

Do have a look before you post a question, and tell us if the gas system is plumbed separately from the heater. You could replace the cable heater tap with a working one. Water hoses without flow through them do not conduct large amounts of heat.

[pfillery]

Do have a look before you post a question, and tell us if the gas system is plumbed separately from the heater. You could replace the cable heater tap with a working one. Water hoses without flow through them do not conduct large amounts of heat.

I'm not quite sure what goes where since it is a mess of pipes under there. I will be having a look this weekend though, I'm fairly certain the gas system is (or should be) seperate to the heater circuit, otherwise without hot water flow the system would presumably not work properly.