Installing underfloor heating in an older home

Keep_pedalling

Next year we plan to carry out a much needed up grade to our heating in our 1930s semi. Currently gas boiler with knackered rads and ancient pipe work so the latter 2 need replacing. We would really love to get rid of the rads and  go with underfloor wet heating (probable driven by a heat pump).

Most of the flooring is raised timber and this need insulating. If anyone have had UFH retrofitted in a similar house I would be interested in your experience and the type of system you had installed as there seems to be a number of options. 

Rodders53

Have you looked at the threads in Energy rather than here in DIY?  
https://forums.moneysavingexpert.com/categories/lpg-heating-oil-solid-other-fuels

Also check on other forums, searching for < 1930s house wet ufh >  throws up some likely useful stuff for me.

Mutton_Geoff

Fitting an ASHP and UFH to an older house is only part of a wider plan that must include raising insulation levels, reducing air leaks etc.

In older houses, it's sometimes easier to rip up the ground floor timbers and pour an insulated slab and lay the UFH pipes on 100mm celotex then screed.

FFHillbilly

Adding wet UFH to a house is likely to add value and it's going to work better with heat pumps in the future, but it's a very disruptive job.
installing insulation and concrete floors would be the way to do it but there are some cases where this is quite difficult and requires more work, for example if the house is built on a hill and the void underneath the floorboards is upto 2 m in places, or if all the ground floor services (electric, gas, water, phone) are currently ran below the floor you will have to re fit all of those into the 1st floor floor space which effectively turns it into a whole house refurb

Keep_pedalling

Mutton_Geoff said:

Fitting an ASHP and UFH to an older house is only part of a wider plan that must include raising insulation levels, reducing air leaks etc.

In older houses, it's sometimes easier to rip up the ground floor timbers and pour an insulated slab and lay the UFH pipes on 100mm celotex then screed.

Yes, fully aware of the need for an updating of the insulation, I already have the walls in hand, underfloor insulation will be added as part of this project (even if we stick with radiators). EPC rating is currently C.