Also known as Air Source Heat Pump Water Heater these are hot water heaters that use a reverse cycle air conditioner system to heat the water and are apparently very efficient to run.

 

But where in Thailand can I buy one from?

Plenty on ALiExpress and other chinese sites but apart from commercial ones I can't see any retailers in Thailand. I must admit, searching in English for Thai websites/items is not very accurate. The only one I can find available in Thailand is the Steibel Eltron WWK 302H butit is eye wateringly expensive. I would rather buy locally in Thaialnd than import one from china due to warranty concerns. 

33 minutes ago, wozzlegummich said:

Also known as Air Source Heat Pump Water Heater these are hot water heaters that use a reverse cycle air conditioner system to heat the water and are apparently very efficient to run.

 

I am currently planning the installation of a heat pump to provide hot water as well as hot water for the radiators for a house I own in the UK.  

 

For my house in Thailand I installed a solar thermal system instead. I paid  ฿30,000 for it 8 years ago and it's still going strong.

 

I have had comments on my YouTube channel from people in the UK saying that a heat pump would provide far more hot water, but we don't get the £7,500 boiler replacement grant here making it a very expensive proposition even if you could find one for sale and someone willing to install it.