CH - alpha pumps

Whoa, guys, you have lost me.!!!

Francis

Reply to
FrancisJK
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Pressure operated. You simply adjust it to the required pressure.

You are assuming that the TRVs are completely closing. This should not happen if the heat delivery and room thermostat in the non TRV space are set correctly

No. Motorised valves can close and then there is no flow path, therefore a bypass is useful.

.andy

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Reply to
Andy Hall

Your original premise of an Alpha pump and then a bypass should you need it is a reasonable one....

.andy

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Reply to
Andy Hall

Don't know about the pump yet. I'll probably go for the alpha, there is an automatic (differential) by-pass in the circuit already. I can close the automatic (differential) by-pass fully, if necessary.

OK, Seconds away Round 10!

Francis

Reply to
FrancisJK

I've a standard boiler but a very non-standard installtion - boiler is 30 metres from the pump and zone valves in a barn. I don't have many TRVs as most areas have a prog thermostat and could probably do without the bypass altogether . But because the system is so large it was suggested here that come the deep of winter I might need a second pump in the system whereupon I think the bypass would be a good safety measure.

In most systems the Alpha will save the £35 just in electricity used for pumping over it's lifetime even if the oil/gas system is no more efficient.

Reply to
G&M

No. My one has the 3 fixed speed curves and a pot to adjust the proportional pressure curve almost infinitesimally. There are some other models introduced since then though.

Reply to
G&M

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