Lotus Energy

13/04/2026

24/03/2026

5 heat pumps fitted this year (3 boilers too, but we don’t talk about that), not only saving tonnes of carbon, but saving clients money too. Thanks to legislation announced in the last Budget, a lot of the levies on electric prices have been moved to general taxation, meaning the spark gap is reducing, making heat pumps cheaper to run that gas boilers in most homes. With the algorithm, install costs are coming down thanks to AI aided design, plus you get a 5 YEAR efficiency guarantee .uk

06/01/2026

Just had my new batteries and inverter delivered, an ‘Earth friendly’ alternative to Lithium batteries. My first foray into the world of home energy storage, but would like to eventually offer it alongside heat pumps, under my own MCS. But let’s see how much admin/training/red tape is involved first.

31/12/2025

So, the results are in on the 5 bed, 280m2 Victorian house, and the results may be surprising. Long story short, the heat loss is around 12.5kW, or just under 45w/2. This house has solid uninsulated 9” brickwork, solid uninsulated floors, uninsulated tile clad timber framed 2nd floor with lathe and plaster internal walls, and a leaky front door. Fabric upgrades are limited to loft insulation where possible, and double glazed windows. The Vitocal 150-A is maintaining 21-22° internal temperature, at -2.4° outside temp (both figures 1° above design), however the flow temp is around 10° below design, proving how far out the whole methodology is. The backup heater did come on in the middle of the night, when the desired indoor temp jumped from 20° to 23° (to take advantage of the off-peak tariff), but only used 1.6kWh of electricity, about 11p worth at that time of day. Sticking to CIBSE design guidelines on this job would have increased the install cost by around £15k, making it entirely untenable and meaning the gas boiler would have remained in use. By looking at actual gas consumption at design conditions, we were able to specify correctly, save around £15k from the install cost, reduce CO2 emissions by around 6 tonnes per year, plus NOT fit loads of extraneous components, each with their own embedded carbon. This strengthens the case for using monitoring and measuring existing heat sources, rather than traditional heat loss survey methods, especially on older properties.

19/12/2025

Very happy with how this panned out. A Victorian farmhouse with solid walls, a CIBSE estimated heat loss of 24kW, but the gas usage didn’t stack up. Smart meter data and checking the boiler efficiency, as well as rules on thumb on annual gas usage, both suggested 11kW total heat loss. By using Historic England data on period properties, as well as being confident enough to slash ACH values right down, resulted in getting the survey heat loss to 13kW, just enough for the biggest Vitocal 150-A. Coupled with a cylinder, and 15 new Charleston column radiators, piped direct with no buffer, it’s working very nicely and settled on a curve of 0.9, which is approx a 47° design flow temperature.

19/12/2025

17/10/2025

This year, we are be mostly fitting, HEAT PUMPS 😍 I’m yet to survey a house where a heat pump wouldn’t work, it’s now even more straightforward with ’s super clever algorithm, which not only designs the least disruptive install possible, but also guarantees a minimum efficiency, what’s not to like?

17/10/2025

Slightly funky pipe route on this, going up and over the alley way, and through a side extension roof to the airing cupboard .uk aroTHERM plus 12kW fitted to a 1850’s detached property, solid walls, some ancient radiators (luckily they are massive), 10mm microbore, all my favourite things. New cylinder, .pro external lagging, loads of other bits and bobs

03/10/2025

Heat pumps are finally cheaper than a boiler swap and sometimes even free.00:00 - Intro 00:30 - Heat Pumps are too expensive01:30 - Gathered home data 01:46 ...

10/08/2025

Fitted our first designed ministore last week, coupled with a .uk 5kW aroTHERM plus. We were replacing an ailing oil fired combi boiler and client was keen to move away from fossil fuels. No airing cupboard, no problem! Luckily this kitchen base unit used to house the old floor standing boiler so had a removable worktop and no base, so we had a tiny bit of room to work. The property already had UFH throughout and was well insulated, so we are projecting a sCOP over 4. A water softener was fitted in an insulated cabinet outside, importantly maintaining the efficiency of the ministore by preventing scale build up. .pro keeping the external pipework protected from the elements.