Temperature of hot water leaving your ashp

[Ian Nixon]

Hi

what temperature do most people run there ashp on for the water leaving it?

i believe this is the temp for the dhw and the water in the heating system

[ProDave]

Mine is an LG

 

It only ever runs in heating mode OR hot water mode, and each has it's own temperature set independantly, it never runs HW and heating at the same time.

 

For DHW mine has a temperature probe built into the tank and it heats the tank until the desired temperature is reached. I have that temperature set to 47 degrees.  To achieve that I have the DHW "water leaving" temperature set to 55 degrees.

 

In heating mode it heats the UFH directly and I have the water leaving temperature set to 37 degrees.

[Ian Nixon]

Oh I see that’s good.  Mine only has 1 temp and then a thermostat on the ufh manifold to turn the temp down.  Mine runs both st same time but I don’t think it should

[ProDave]

What make and model is it?

[Ian Nixon]

Its make is Dream

[ProDave]

This one? http://dreamheatpumps.co.uk/5kw_heat_pump_HOME.html

 

Not much information on their website. No mention of an inverter drive so it is probably very basic and all or nothing?

 

No downloads to manuals or any useful technical specification.

[Ian Nixon]

I’ve got a manual.  I have a plate with a part number on but I’m unsure what you are getting at?  I know it only has one setting to put a temperature in as it was the manufacturer who called me and told me what to do.

[ProDave]

I was trying to find a copy of the manual to have a look at. The exact model number would help to search to see if it is available on line.  Without seeing the manual I can't add much to whether there may be different options.

 

It is somewhat of a limitation if there is indeed only one set temperature available.

[Ian Nixon]

I see what you are saying.  I do think it is a cheap Chinese one been fitted though lol

[dpmiller]

Dreams are sold as a kinda "boiler replacement" unit so likely just the one temperature.

[newhome]

So what’s the issue with the single temperature on your set up? Shouldn’t you be setting it at a temperature appropriate for your DHW and letting the blending valve or whatever you have set up control the UFH at a lower temperature? 

[ProDave]

The trouble with a single temperature is it will be a high temperature for DHW, so will be likely too hot for UFH and the heat pump will not run anywhere near as eficcient as it would running at a lower temperature for heating.

[Ian Nixon]

20 hours ago, newhome said:

So what’s the issue with the single temperature on your set up? Shouldn’t you be setting it at a temperature appropriate for your DHW and letting the blending valve or whatever you have set up control the UFH at a lower temperature? 

That’s what I do.  

[Ian Nixon]

20 hours ago, ProDave said:

The trouble with a single temperature is it will be a high temperature for DHW, so will be likely too hot for UFH and the heat pump will not run anywhere near as eficcient as it would running at a lower temperature for heating.

 

Edited January 14, 2019 by Ian Nixon