Riga, Latvia


Demo responsible: Technical University of Riga

Type of building: Small residential. Two single-family-houses (2012/2013) in Imanta and Sunisi.




Heated space

235 m2

96 m2

Electricity consumption

~4.4 MWh/year

~7.2 MWh/year

Gas consumption

~39.6 MWh/year

168.5 kWh/m2

~21 MWh/year

218.8 kWh/m2


Individual gas boiler for DHW and space heating through radiators (Imanta, Sunisi) and under-floor heating (only Sunisi)


Demonstration action:

  • TP2: mixed solar-assisted integration of gas-driven thermal compression heat pump with boiler (Boostheat) for space heating + DHW
  • Hybrid solar PV-T panels (DualSun) to assist BH evaporator and for preheating and for the electricity production for building appliances coupled with glycol storage and stratified thermal storage tank (Ratiotherm)
  • Smart Energy electrical heater for residual PV-T electricity

Technical and social risks & difficulties:

Initial assessment: very limited risk in coupling both innovations (i.e. HP boiler and solar hybrid PV-T).
However, a number of challenges observed during deployment phase:

  • The technologies are unknown to the Latvian market and the installers have limited experience
  • Successful integration of controls requires active involvement of all technology providers
  • Unfamiliarity and precaution of potential end-users to decide swapping their existing ”old, reliable” gas boiler with a completely new technology package consisting of a number of components
  • The new technology package needs much more space compared to the old gas boiler, so the existing boiler rooms were not suited for that and other premises were used
  • The procedure for approval of solar panels was significantly relaxed in Latvia during our deployment phase (now approval of municipality is generally not required)
  • Approval of new gas piping installation time-consuming, long waiting lines of the gas DSO as a result of Covid-related restrictions and a lot of construction work ongoing

Replicability potential:

  • Small residential (single houses 30% in Latvia) with natural gas connection (48% of dwellings in Latvia). New and renovated buildings
  • All climates

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