I was interviewed for a position in a smart meter manufacturing company by director or at least he had that title. He could not give me one single reason to install a smart meter.
I did all the calcs a few years ago. As a good rule of thumb, as long as gas is less than 25% the cost of electricity per kWh there is no economic benefit to having an ASHP. That is excluding the cost of installation and various upgrades needed to make the installation effective. Including those and even with grants, a gas boiler is the way.
We have installed a Bosch ‘Plug & Go’ induction hob in our last property and also replaced our own gas hob with the same. Never look back. Induction hobs are much more economical than gas hobs.
I would advise your tenant against prepayment meters as they are much more expensive and the tariffs are always higher than average.
The new help from the government to cap the price of the average household to £2500 has reduced the risk of people paying over £5k as expected. In layman’s terms the average customers will only be paying 6% more ( once you factor in the £400 that everyone will receive in a rebate already being provided) on what they are paying right now which I respect is still a thousand pounds more than last year but way way less than what it could have been from January 2023.
I hope this information puts your tenant at ease and stops her making the mistake of switching to prepay.
Also just let you know smart meters will perform in the exact same way regardless of switching suppliers all that changes with be the the device on which customers can monitor their usage. I used to work for RWE Npower as an SME Key accounts manager so have studied smart metering to mind numbing levels but definitely a good thing to have for all concerned in the future.