• April 9, 2014 - Domestic Renewable Heat Incentive Released - Solar Thermal has got the great government funding through the Domestic RHI which it deserves! Solartwin Solar Thermal panels have just become not only a cost cutting and very green option to heat your water but now you will receive additional... More →
  • November 6, 2013 - Notice to Solartwin customers - Letter's from Stenfield & Co - A number of Solar Twin Ltd customers have been in touch this week to query a letter they have received from legal firm Stenfield & Co. - The content relates to Solar Twin Ltd's liquidation, and claims that customers "undoubtedly paid more than... More →
  • July 12, 2013 - Renewable Heat Incentive Updated - Solar Thermal to have Heavy Support - The Government have today released the Renewable Heat Incentive: The first step to transforming the way we heat our homes. If you are looking to buy a SolarTwin System contact Genfit. "the scheme will be open to anyone in these groups who installed... More →
  • May 27, 2013 - DECC announce they are doubling the RHPP grant for solar thermal from £300 to £600 - Solar Thermal Panels Receive Huge Renewable Heat Premium Payment - Solar Thermal has received a huge boost, it's a great time to buy a Solartwin Product. - Greg Barker tweeted about the scheme - - Big uplift for #RHPP Vouchers to put a shot in the... More →
  • February 14, 2013 - Solartwin DIY reviews - SolarTwin Reviews from Reviewcentre - "Review Centre is a community of real people, just like you, sharing their product and service experiences. - Our community of reviewers are a passionate bunch who want to help you discover what's right for... More →
  • January 17, 2013 - Crackdown on aggresive solar selling - YouGen, a leading consumer body serving the renewable and energy efficiency sectors, is calling for a change in the law after a review by the Office of Fair Trading revealed unscrupulous selling tactics by solar and other energy efficiency... More →

Solar water heating systems = Solar panels + solar energy. Solar thermal: solar power & solar hot water.

RHPP and renewable heating premium payment

Solar water heating panels for swimming pools

please note these are guidance, not specifications

Concerning sizing there are two very useful rule of thumb approaches. One is based on pool size and the other one, the peak capacity of the existing heater. Both these rules of thumb overlap, which can be useful. Full heat loss modeling and panel specification formulae programs are available free on Canadian government websites.

In terms of pool size, in UK we recommend around 30% – 60% (or more) of the pool area should be repeated as panels (each of which has an aperture – heat absorber – area of 2.8 sq metres). This rule of thumb means 1-2 Solartwins per 10 sqm of pool area, with the lower end for taking the chill off outdoor or seasonal pools, the upper end for indoor or all year pools.

In terms of the existing heater, since this usually reflects a heat demand calculation, we suggest around one panel per 2 kW of the pool’s existing heater’s peak capacity. This is only very general measure and is not as useful as the area assessment.

As for plumbing in, and pumping options, there are 3 main options, the first 2 using solar pumping, the last using the filter pump.

1 – For small pools using say 3 or fewer panels, just use Standard Solartwin PV pumps, one per panel. A plumbing diagram is suggested below. Good for remote locations and small summer pools with occasional filtration.

Pool_Diagram.gif

2 – With solar pumping options using 4 or more panels, we suggest larger pumps, one or more, depending on the number of panels. We can supply these. Reducing the number of pumps has little bearing on the cost per unit since the area of the photovoltaic panel and the cost of the pump increases almost proportionately. PV pumping is particularly good for remote locations.

3 – For larger pools, where the filter pump is on all day, we suggest using panels only, without our pumps. Instead of PV pumps, when there is any heat to be gained from the panels, we divert some water downstream of the filter pump to collect it from them by using a motorised valve. We control the valve using a conventional solar “differential temperature controller” so that when panel temp exceeds pool temp the valve opens.

As for plumbing outlet and inlet arrangements, provided the filter and its pump do not obstruct the flow by a head of more than 300 mm of water (for a flow rate of 3 litres per minute, per panel and exceeding this is unlikely) it is best to provide a draw off tee using a 22mm conventional plastic pipe downstream of the existing filter in such a way that the water is gently drawn through the filter and not backwards through the pool recirculating exits. Preventing such backflow usually requires the installation of a valve downstream of the draw off point to prevent this. Concerning the entry of the water to the pool, the solar warmed water is best injected at a low level into the pool either via existing vent point(s) or via new one(s). It should not be injected near the surface since the warmer water would then stratify (float) over the cool water rather than be encouraged to mix as it rises.

We provide special polypropylene connectors (instead of brass reducers / pipe inserts) for pool systems – to minimise corrosion in pool water.

Notes on general pool energy efficiency and related green issues:

  • Minimise heat loss
    • Pool covers insulate the pool surface and minimise evaporative heat loss
    • from pool edges – insulate under the sides and bottom of the pool at the design stage
    • from the pool room(s) including changing areas
    • pump room including the ceiling
  • Maximise pool usability but minimise fuel costs
    • review your tariffs – and are you buying the cheapest / greenest fuels?
    • if particularly tender grandchildren only come on Saturday, only turn the stat up on Friday, don’t keep it high all week
  • Use active or passive heat recovery systems
    • from the drained off water
    • from ventilation systems / air changes
  • Use renewable energy
    • biomass such as wood chip boiler
    • heat pumps…
    • other
    • solar, both passive and active (see earlier for active, below for passive
  • Maximise passive solar gain
    • get direct sun light in for as long as possible during the day!
    • minimise shading from trees and buildings etc
    • get some extra reflected sun in
    • paint S facing walls above the N side of the pool white
    • absorb that heat into the water
    • consider dark pool coatings, at least on the S facing wall of pool

Remember every pool is different so please call 0344 567 9032 to discuss your specific requirements.

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0344 567 9032

Domestic Renewable Heat Incentive Released

Solar Thermal has got the great government funding through the Domestic RHI which it deserves! Solartwin Solar Thermal panels have just become not only a cost cutting and very green option to heat your water but now you will receive additional funding too! The Domestic RHI rates – Released April 2014 Ofgem have produced a […]

Read More | Archives

Notice to Solartwin customers – Letter’s from Stenfield & Co

A number of Solar Twin Ltd customers have been in touch this week to query a letter they have received from legal firm Stenfield & Co. The content relates to Solar Twin Ltd’s liquidation, and claims that customers “undoubtedly paid more than you should have and it is highly likely that you will have been […]

Read More | Archives

Renewable Heat Incentive Updated – Solar Thermal to have Heavy Support

The Government have today released the Renewable Heat Incentive: The first step to transforming the way we heat our homes. If you are looking to buy a SolarTwin System contact Genfit. “the scheme will be open to anyone in these groups who installed an eligible technology since 15th July 2009” so if you have a […]

Read More | Archives

DECC announce they are doubling the RHPP grant for solar thermal from £300 to £600

Solar Thermal Panels Receive Huge Renewable Heat Premium Payment Solar Thermal has received a huge boost, it’s a great time to buy a Solartwin Product. Greg Barker tweeted about the scheme – Big uplift for #RHPP Vouchers to put a shot in the arm of the market ahead of full Domestic #RHI tinyurl.com/ktxz3o2 — Greg […]

Read More | Archives

Solartwin DIY reviews

SolarTwin Reviews from Reviewcentre “Review Centre is a community of real people, just like you, sharing their product and service experiences. Our community of reviewers are a passionate bunch who want to help you discover what’s right for you.” (Review Centre) We are well rated on review centre, this shows the excellent product quality of […]

Read More | Archives


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