View Full Version : Daikin heat pump for underfloor

18-11-2015, 07:43 PM
Have a client who uses gas to heat his underfloor of 90sqm and wants a Daikin heat pump he has 6 solar panels so this heats the floor from 9 am to 4 pm on a sunny day he also has two 200 l tanks what's the best Daikin kW system to heat this ? As he wants to get rid of the gas

18-11-2015, 10:26 PM
As there is only an underfloor heating requirement, your client has more choice in that he can utilise the Altherma LT system which will give a flow temperature of up to 55degC. The system becomes more efficient if the flow temperature is reduced.
Most underfloor systems do not require more than 38-40degC flow temperature.
Presumably the 200litre tanks are heated primarily by the solar system.
If you choose a very small heat output Altherma, the recovery time to bring 400 litres back up to the required storage temperature will be quite lengthy.
If the Altherma is used to supplement the solar during the hours of darkness, then you may have to consider using a larger capacity system.
Is your client looking for a split system, which will need to be installed by an air conditioning engineer or the monoblock system whicjh can be installed by a heating engineer?
In theory, the Altherma will be more economical to run than the gas fired boiler due to the beneficial operating efficiencies.

19-11-2015, 12:23 AM
Thank you can he use this for hot water ? Having two bathrooms and small kitchen

19-11-2015, 07:30 AM
Yes the Altherma LT can provide domestic hot water regeneration up to 48degC and then uses an immersion heater to boost the stored water temperature to the desired setting.
You will need to use an approved water storage cylinder, probably best to go with the 200 litre size, to prevent running out of hot water.
Presumably the two 200 litre tanks you mention are used as a thermal store for the underfloor heating?

20-11-2015, 06:59 AM
The two tanks are for underfloor and they have a 200 l tank and solar panel for water